Spinal Cord Nervous Tissue Quiz
The spinal cord is part of our nervous system, it is a tubular bundle of nervous tissue and support cells. Let's play this quiz and learn more about it!
Questions and Answers
- 1.
The upper motor neurons that control skeletal muscles begin with a soma in
- A.
The postcentral gyus of the cerebrum
- B.
The precentral gyrus of the cerebrum
- C.
The motor association cortex of the cerebrum
- D.
The anterior horn of the spinal cord
- E.
The posterior horn of the spinal cord
Correct Answer
B. The precentral gyrus of the cerebrumExplanation
The correct answer is the precentral gyrus of the cerebrum. The precentral gyrus is located in the frontal lobe of the cerebrum and is responsible for initiating voluntary muscle movements. It contains the primary motor cortex, which sends signals to the lower motor neurons in the spinal cord to control skeletal muscles.Rate this question:
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- 2.
The signals that control your handwriting travel down the spinal cord in
- A.
The corticospinal tract
- B.
The tectospinal
- C.
The lateral vestibulospinal tract
- D.
The medial vestibulospinal tract
- E.
The spinocerebellar tract
Correct Answer
A. The corticospinal tractExplanation
The corticospinal tract is responsible for controlling voluntary movements, including handwriting. This pathway starts in the motor cortex of the brain and travels down the spinal cord, allowing signals to be transmitted from the brain to the muscles involved in handwriting. The other options listed are involved in different functions such as reflexes, coordination, and balance, but they are not specifically related to controlling handwriting.Rate this question:
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- 3.
Many upper motor neurons synapse with lower motor neurons in
- A.
The posterior horns
- B.
The anterior horns
- C.
The posterior column
- D.
The anterior column
- E.
The posterior root ganglion
Correct Answer
B. The anterior hornsExplanation
The correct answer is the anterior horns. Upper motor neurons are responsible for carrying signals from the brain to the spinal cord, where they synapse with lower motor neurons. These synapses occur in the gray matter of the spinal cord, specifically in the anterior horns. The anterior horns contain cell bodies of lower motor neurons, which then send signals to the muscles to initiate movement.Rate this question:
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- 4.
Which if the following sensory functions involves neurons in the posterior root ganglia?
- A.
Smell
- B.
Hearing
- C.
Vision
- D.
Touch
- E.
Taste
Correct Answer
D. TouchExplanation
The sensory function that involves neurons in the posterior root ganglia is touch. The posterior root ganglia are clusters of cell bodies located along the posterior roots of the spinal nerves. These ganglia contain sensory neurons that transmit touch sensations from the skin to the central nervous system. This allows us to perceive and interpret tactile stimuli such as pressure, temperature, and pain.Rate this question:
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- 5.
The spinal cord is divided into all of the following regions except
- A.
Cervical
- B.
Pelvic
- C.
Thoracic
- D.
Sacral
- E.
Lumbar
Correct Answer
B. PelvicExplanation
The spinal cord is divided into different regions, namely cervical, thoracic, lumbar, and sacral. The pelvic region is not a division of the spinal cord. This is because the pelvic region refers to the lower part of the abdomen and pelvis, which is not directly associated with the spinal cord. Therefore, the correct answer is pelvic.Rate this question:
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- 6.
The following are all functions associated with the spinal cord expect
- A.
To conduct motor information down the cord
- B.
To coordinate the alternating contraction of several muscle groups associated with locomotion
- C.
To protect neurons in both the ascending and descending tract
- D.
To mediate a reflex such as withdrawal of a hand from pain
- E.
To conduct sensory information up to the brain
Correct Answer
C. To protect neurons in both the ascending and descending tractExplanation
The correct answer is "to protect neurons in both the ascending and descending tract." The functions listed in the question all pertain to the role of the spinal cord in motor and sensory processing. However, the spinal cord does not have a specific function to protect neurons in both the ascending and descending tracts. Its primary role is to transmit motor commands from the brain to the body and sensory information from the body to the brain.Rate this question:
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- 7.
Which of the following fractures would be the least likely to cause a spinal cord injury?
- A.
A fracture of vertebra L4
- B.
A fracture of vertebra T12
- C.
A fracture of vertebra T5
- D.
A fracture of vertebra C6
- E.
A fracture of vertebra C2
Correct Answer
A. A fracture of vertebra L4Explanation
A fracture of vertebra L4 would be the least likely to cause a spinal cord injury because the spinal cord ends at the level of the first lumbar vertebra (L1). Therefore, a fracture of vertebra L4 would be below the level of the spinal cord, reducing the risk of injury to the spinal cord.Rate this question:
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- 8.
Epidural anethesia is introduced in the epidural space between to block pain signals during pregnancy
- A.
Dura mater and pia mater
- B.
Arachnoid mater and pia mater
- C.
Dura mater and arachnoid mater
- D.
Dural sheath and vertebral bones
- E.
Dural sheath and dura mater
Correct Answer
D. Dural sheath and vertebral bones -
- 9.
Cerebrospinal fluid fills in the space between
- A.
Dura mater and pia mater
- B.
Dura sheath and dura mater
- C.
Arachnoid mater and pia mater
- D.
Dura sheath and vertebral bones
- E.
Dura mater and arachnoid mater
Correct Answer
C. Arachnoid mater and pia materExplanation
Cerebrospinal fluid fills in the space between the arachnoid mater and pia mater. The arachnoid mater is the middle layer of the meninges, which are the protective membranes that surround the brain and spinal cord. The pia mater is the innermost layer of the meninges. The space between the arachnoid mater and pia mater is known as the subarachnoid space, and it is filled with cerebrospinal fluid. This fluid acts as a cushion, protecting the brain and spinal cord from injury and providing nutrients and waste removal for these structures.Rate this question:
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- 10.
Which of the following structures is the richest in lipid content?
- A.
Gray matter
- B.
Arachnoid mater
- C.
White matter
- D.
Dura mater
- E.
Pia mater
Correct Answer
C. White matterExplanation
White matter is the correct answer because it contains a high concentration of myelinated nerve fibers, which are composed mainly of lipids. Myelin is a fatty substance that surrounds and insulates nerve fibers, allowing for efficient transmission of electrical signals. Therefore, white matter, which is primarily made up of myelinated axons, has a higher lipid content compared to the other structures listed.Rate this question:
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- 11.
Gray matter contains
- A.
Neurosomas, dendrites, and proximal parts of axons of neurons
- B.
The distal part of axons of lower order motor neurons
- C.
Glial cells only
- D.
Glial cells, axons of motor neurons, and Schwann cells
- E.
Glial cells and myelinated fibers
Correct Answer
A. Neurosomas, dendrites, and proximal parts of axons of neuronsExplanation
Gray matter is a region in the central nervous system that contains the cell bodies (neurosomas) of neurons, along with their dendrites and the proximal parts of their axons. This is where most of the information processing occurs in the brain. The other options are incorrect because they either do not include the cell bodies and dendrites of neurons or include additional components such as glial cells, axons of motor neurons, and Schwann cells, which are not typically found in gray matter.Rate this question:
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- 12.
carry motor commands from the brain along the spinal cord.
- A.
Cranial nerves
- B.
Descending tracts
- C.
Spinal nerves
- D.
Ascending tracts
- E.
Both anterior and posterior roots
Correct Answer
B. Descending tractsExplanation
Descending tracts carry motor commands from the brain along the spinal cord. These tracts are responsible for transmitting signals from the brain to the muscles, allowing voluntary movement. They are part of the central nervous system and are located within the spinal cord. Descending tracts play a crucial role in coordinating and controlling movements throughout the body.Rate this question:
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- 13.
Second-order neurons synapse with third-order neurons in the
- A.
Dorsal root ganglion
- B.
Thalamus
- C.
Spinal cord
- D.
Cerebral cortex
- E.
Medulla oblongata
Correct Answer
B. ThalamusExplanation
Second-order neurons synapse with third-order neurons in the thalamus. The thalamus is a relay station in the brain that receives sensory information from various parts of the body and sends it to the cerebral cortex for further processing. In the sensory pathway, the first-order neurons transmit signals from the sensory receptors to the spinal cord or brainstem, where they synapse with second-order neurons. These second-order neurons then carry the signals to the thalamus, where they synapse with third-order neurons. The thalamus acts as a gateway, filtering and directing sensory information to the appropriate areas of the cerebral cortex for perception and interpretation.Rate this question:
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- 14.
keeps nerve fibers insulated from one another
- A.
Blood vessels
- B.
Epineurium
- C.
Fascicles
- D.
Endoneurium
- E.
Perineurium
Correct Answer
D. EndoneuriumExplanation
The endoneurium is a connective tissue layer that surrounds individual nerve fibers. It acts as a protective barrier and helps to keep the nerve fibers insulated from one another. This insulation is important because it allows for efficient transmission of electrical signals along the nerve fibers. The endoneurium also provides support and nutrition to the nerve fibers, helping to maintain their health and function.Rate this question:
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- 15.
fibers innervate eyes and ears
- A.
General
- B.
Somatic
- C.
Visceral
- D.
Special
- E.
White
Correct Answer
D. SpecialExplanation
The correct answer is "special." This is because the statement "fibers innervate eyes and ears" refers to sensory fibers that are responsible for transmitting information from the special senses of vision and hearing. These special senses are distinct from the general senses (such as touch and pain) and the visceral senses (such as those related to internal organs). Therefore, the correct classification for the fibers innervating the eyes and ears would be "special."Rate this question:
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- 16.
A ganglion is a
- A.
Cluster of neurosomas in the PNS
- B.
Bundle of axons in the CNS
- C.
Cluster of dendrites in either the CNS or the PNS
- D.
Bundle of axons in the PNS
- E.
Cluster of neurosomas in the CNS
Correct Answer
A. Cluster of neurosomas in the PNSExplanation
A ganglion is a cluster of neurosomas in the peripheral nervous system (PNS). Neurosomas are the cell bodies of neurons, and ganglia are collections of these cell bodies. Ganglia are found outside of the brain and spinal cord, and they play a role in processing and relaying sensory information. This explanation aligns with the given answer choice, which states that a ganglion is a cluster of neurosomas in the PNS.Rate this question:
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- 17.
There are pairs of spinal nerves
- A.
12
- B.
24
- C.
31
- D.
35
- E.
62
Correct Answer
C. 31Explanation
The spinal cord is composed of 31 pairs of spinal nerves. These nerves emerge from the spinal cord and branch out to various parts of the body. Each pair of spinal nerves is connected to a specific segment of the spinal cord, allowing for communication between the brain and different areas of the body. Therefore, the correct answer is 31.Rate this question:
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- 18.
The ventral rami of the spinal nerves form plexuses in all regions except
- A.
The thoracic region
- B.
The brachial region
- C.
The cervical region
- D.
The lumbar region
- E.
The sacral region
Correct Answer
A. The thoracic regionExplanation
The ventral rami of the spinal nerves form plexuses in all regions except the thoracic region. Plexuses are networks of nerves that form by the merging of ventral rami from adjacent spinal nerves. These plexuses are responsible for innervating different areas of the body. The brachial plexus is formed by the ventral rami of the spinal nerves in the brachial region, the cervical plexus is formed in the cervical region, the lumbar plexus is formed in the lumbar region, and the sacral plexus is formed in the sacral region. However, in the thoracic region, the ventral rami do not form a plexus but rather continue as intercostal nerves that innervate the muscles and skin of the thoracic wall.Rate this question:
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- 19.
The cervical plexus gives origin to the nerve(s).
- A.
Oculomotor
- B.
Sciatic
- C.
Musculocutaneous
- D.
Phrenic
- E.
Radial
Correct Answer
D. PhrenicExplanation
The cervical plexus is a network of nerves that originates from the spinal cord in the neck region. It supplies motor and sensory innervation to various structures in the neck and upper thorax. The phrenic nerve is one of the major branches of the cervical plexus. It arises from the third, fourth, and fifth cervical nerves and provides motor innervation to the diaphragm, the main muscle involved in respiration. Therefore, the correct answer is phrenic.Rate this question:
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- 20.
Which of the following nerves originates in the coccygeal plexus?
- A.
Axillary
- B.
Sciatic
- C.
Phrenic
- D.
Ilioinguinal
- E.
Orbturator
Correct Answer
B. SciaticExplanation
The sciatic nerve originates in the coccygeal plexus.Rate this question:
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- 21.
Which of these is an ascending tract of spinal cord
- A.
The lateral tectospinal tract
- B.
The medial reticulospinal tract
- C.
The ventral corticospinal tract
- D.
The gracile fasiculus
- E.
The vestibulospinal tract
Correct Answer
D. The gracile fasiculusExplanation
The gracile fasciculus is an ascending tract of the spinal cord that carries sensory information related to proprioception, vibration, and deep touch from the lower limbs and lower trunk to the brain. It is located in the posterior column of the spinal cord and ascends on the same side of the body from where the sensory information is received. The other options listed are descending tracts or tracts that carry motor information, making the gracile fasciculus the correct answer.Rate this question:
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- 22.
A mixed nerve consist of both
- A.
Myelinated and unmyelinated fibers
- B.
Glial cells and nerve cells
- C.
Afferent and efferent fibers
- D.
Association and integration neurons
- E.
Spinal and cranial fibers
Correct Answer
C. Afferent and efferent fibersExplanation
A mixed nerve consists of both afferent and efferent fibers. Afferent fibers transmit sensory information from the peripheral nervous system to the central nervous system, while efferent fibers transmit motor information from the central nervous system to the peripheral nervous system. Therefore, a mixed nerve contains both types of fibers, allowing for the bidirectional transmission of signals between the central and peripheral nervous systems.Rate this question:
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- 23.
Which of the following branches of a spinal nerve have somas of solely sensory neurons?
- A.
Posterior (dorsal) root
- B.
Anterior (ventral) root
- C.
Posterior ramus
- D.
Anterior ramus
- E.
Meningeal branch
Correct Answer
A. Posterior (dorsal) rootExplanation
The posterior (dorsal) root of a spinal nerve contains somas of solely sensory neurons. This means that these neurons are responsible for transmitting sensory information from the body to the central nervous system. The other options, such as the anterior (ventral) root, posterior ramus, anterior ramus, and meningeal branch, do not exclusively contain sensory neurons.Rate this question:
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- 24.
The bundle of nerve roots tha occupy the vertebral canal from L2 to S5 is called the
- A.
Cauda equina
- B.
Medullary cone
- C.
Lumbar enlargement
- D.
Cervical enlargement
- E.
Spinal cord
Correct Answer
A. Cauda equinaExplanation
The correct answer is cauda equina. The cauda equina is a bundle of nerve roots that occupy the vertebral canal from L2 to S5. It is located below the level of the spinal cord and resembles a horse's tail, hence the name "cauda equina". This bundle of nerve roots is responsible for transmitting sensory and motor signals to and from the lower limbs and pelvic organs.Rate this question:
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- 25.
Somatosensory refers to these sensory signals except the sensory signals from
- A.
Bones and muscles
- B.
Joints
- C.
Proprioceptors
- D.
The viscera
- E.
The skin
Correct Answer
D. The visceraExplanation
The term somatosensory refers to sensory signals from various parts of the body, including the bones and muscles, joints, proprioceptors, and the skin. However, it does not include sensory signals from the viscera, which refers to the internal organs of the body.Rate this question:
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- 26.
Neurosomas of the posterior root are located in the , whereas neurosomas of the anterior root are located in the .
- A.
Posterior root ganglion; gray matter
- B.
Posterior root ganglion; white matter
- C.
Gray matter; white matter
- D.
Posterior root; anterior root
- E.
White matter; gray matter
Correct Answer
A. Posterior root ganglion; gray matterExplanation
The neurosomas of the posterior root are located in the posterior root ganglion, which is a collection of cell bodies of sensory neurons. On the other hand, the neurosomas of the anterior root are located in the gray matter, which is a region of the spinal cord that contains cell bodies of motor neurons.Rate this question:
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- 27.
A is a cordlike organ composed of numerous .
- A.
Nerve fibers; nerves
- B.
Nerve fiber; axons
- C.
Nerve; axons
- D.
Nerve fibers; neurosomas
- E.
Nerve; neurosomas
Correct Answer
C. Nerve; axonsExplanation
A nerve is a cordlike organ composed of numerous axons.Rate this question:
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- 28.
Which of the following groups of muscles have the most muscle spindles?
- A.
Muscles of the hand
- B.
Muscles of the back
- C.
Muscles of the thigh
- D.
Muscles of the middle-ear
- E.
Muscles of the torso
Correct Answer
A. Muscles of the handExplanation
The muscles of the hand have the most muscle spindles. Muscle spindles are sensory receptors located within the muscles that detect changes in muscle length and help regulate muscle contraction. The muscles of the hand are responsible for fine motor control and precise movements, requiring a high degree of proprioception. Therefore, they have a greater number of muscle spindles compared to other muscle groups like the back, thigh, middle-ear, and torso.Rate this question:
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- 29.
These are all properties of reflexes except
- A.
Reflex responses are very predictable
- B.
Reflexes are responses to sensory inputs
- C.
Reflexes are quick responses of the nervous system
- D.
Reflexes are spontaneous actions of the nervous system
- E.
Reflexes are not voluntary
Correct Answer
D. Reflexes are spontaneous actions of the nervous systemExplanation
Reflexes are not spontaneous actions of the nervous system because they are involuntary and occur in response to sensory inputs. Unlike voluntary actions, reflexes do not require conscious thought or decision-making. They are quick responses that are triggered automatically and are often predictable.Rate this question:
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- 30.
A muscle spindle contains mostly
- A.
Glial cells
- B.
Muscle fibers
- C.
Fascicles
- D.
Nerves
- E.
Nerve cells
Correct Answer
B. Muscle fibersExplanation
A muscle spindle is a sensory organ located within skeletal muscles that detects changes in muscle length and tension. It consists of specialized muscle fibers called intrafusal fibers, which are surrounded by connective tissue and sensory nerve endings. These muscle fibers are responsible for providing feedback to the central nervous system about muscle length and tension. Therefore, the correct answer is muscle fibers.Rate this question:
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- 31.
A nurse pricks your finger to type your blood. You flinch at the pain, pulling your hand back. THis is called the
- A.
Pain reflex
- B.
Stretch (myptatic) reflex
- C.
Flexor (withdrawal) reflex.
- D.
Tendon reflex
- E.
Crossed extension reflex
Correct Answer
C. Flexor (withdrawal) reflex.Explanation
When the nurse pricks your finger and you flinch at the pain, pulling your hand back, this is an example of the flexor (withdrawal) reflex. This reflex is an automatic response that helps protect the body from potential harm. When the pain receptors in your finger are stimulated, sensory neurons send signals to the spinal cord, which then activates motor neurons to contract the muscles in your arm and pull your hand away from the source of pain. This reflex occurs without conscious thought and is a protective mechanism to prevent further injury.Rate this question:
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- 32.
The quickest reflex arcs involve only two neurons, thus forming reflex arcs.
- A.
Ipsilateral
- B.
Contralateral
- C.
Polysynaptic
- D.
Monosynaptic
- E.
Autonomic
Correct Answer
D. MonosynapticExplanation
The quickest reflex arcs involve only two neurons, thus forming monosynaptic reflex arcs. In a monosynaptic reflex arc, the sensory neuron directly synapses with the motor neuron, allowing for a rapid response to a stimulus. This direct connection between the sensory and motor neuron eliminates the need for additional processing and synaptic connections, resulting in a faster reflex response.Rate this question:
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- 33.
The flexor (withdrawal) reflex employs a , which maintains a sustained contraction.
- A.
Parallel after-discharge circuit
- B.
Diverging circuit
- C.
Converging circuit
- D.
Closed circuit
- E.
Reverberating circuit
Correct Answer
A. Parallel after-discharge circuitExplanation
The flexor (withdrawal) reflex involves the activation of a parallel after-discharge circuit. This circuit allows for a sustained contraction of the muscles involved in the reflex. After the initial stimulus, the circuit continues to send signals to the muscles, causing them to remain contracted for a longer period of time. This sustained contraction is important for the withdrawal reflex to effectively remove the body part from a potentially harmful stimulus.Rate this question:
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- 34.
If a bee sting on the right though causes quick involuntary reaction of the right arm, this would be an example of
- A.
An ipsilateral reflex
- B.
An intersegmental reflex
- C.
A withdrawal reflex
- D.
A crossed extensor reflex
- E.
A contralateral reflex
Correct Answer
B. An intersegmental reflexExplanation
An intersegmental reflex refers to a reflex that involves communication between different segments or levels of the spinal cord. In this scenario, when a bee sting on the right side causes a quick involuntary reaction of the right arm, it suggests that the reflex arc involves multiple segments of the spinal cord. The signal travels from the sensory receptor in the right arm to the spinal cord, where it is processed and then sent to the motor neurons that control the muscles in the right arm, resulting in the quick involuntary reaction. This indicates the involvement of multiple segments or levels of the spinal cord, making it an intersegmental reflex.Rate this question:
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- 35.
The sensitivity of the muscle spindle is maintained by
- A.
A stretch reflex
- B.
Alpha motor neurons
- C.
Gamma motor neurons
- D.
Anulospiral endings
- E.
Secondary afferent (group II) fibers
Correct Answer
C. Gamma motor neuronsExplanation
Gamma motor neurons are responsible for maintaining the sensitivity of the muscle spindle. These neurons innervate the intrafusal muscle fibers within the muscle spindle, which are specialized sensory receptors that detect changes in muscle length and tension. By controlling the contraction of the intrafusal fibers, gamma motor neurons adjust the sensitivity of the muscle spindle, allowing it to accurately detect muscle stretch and contribute to the stretch reflex. This ensures that the muscle spindle can effectively provide feedback to the central nervous system about changes in muscle length, helping to regulate muscle tone and coordination.Rate this question:
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- 36.
The fibers that carry action potentials to cause skeletal muscle to contract are
- A.
Gamma motor neurons
- B.
Anulospiral endings
- C.
Intrafusal fibers
- D.
Alpha motor neurons
- E.
Extrafusal fibers
Correct Answer
D. Alpha motor neuronsExplanation
Alpha motor neurons are responsible for carrying action potentials from the central nervous system to the skeletal muscles, causing them to contract. These neurons directly innervate the extrafusal fibers, which are the main contractile units of skeletal muscle. Gamma motor neurons, on the other hand, innervate intrafusal fibers, which are specialized muscle fibers found within muscle spindles. Anulospiral endings are sensory receptors found within muscle spindles that detect changes in muscle length and rate of change. Therefore, the correct answer is alpha motor neurons as they directly stimulate the contraction of skeletal muscles.Rate this question:
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- 37.
You go to the movies after a long day and you begin to nod off as soon as the movie starts. Your head starts to lower a little but this reflex causes your head to rise. This is called the
- A.
Tendon reflex
- B.
Crossed extension reflex
- C.
Withdrawal reflex
- D.
Stretch (myotatic) reflex
- E.
Flexor (withdrawal) reflex
Correct Answer
D. Stretch (myotatic) reflexExplanation
The stretch (myotatic) reflex is the correct answer. This reflex occurs when a muscle is stretched, causing a reflexive contraction of that muscle to prevent overstretching or damage. In this scenario, as the person's head starts to lower due to nodding off, the stretch reflex is activated, causing the muscles in the neck to contract and raise the head back up. This reflex helps to maintain posture and prevent injury.Rate this question:
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- 38.
In the patellar tendon reflex arc, the patellar ligament is stretched, which stretches the quadriceps femoris muscle of the thigh. This reflex will cause the quadriceps femoris to
- A.
Contract and the antagonist muscles, the hamstrings, to relax
- B.
Contract and the hamstrings also contract
- C.
Relax and the hamstrings to contract
- D.
Relax and the hamstrings also to relax
- E.
Relax without any effect on the hamstrings
Correct Answer
A. Contract and the antagonist muscles, the hamstrings, to relaxExplanation
The patellar tendon reflex arc involves the stretching of the patellar ligament, which in turn stretches the quadriceps femoris muscle. This reflex causes the quadriceps femoris to contract, resulting in the extension of the leg. Additionally, the reflex also causes the antagonist muscles, the hamstrings, to relax. This is a normal response to maintain balance and stability during movements such as kicking or jumping.Rate this question:
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- 39.
Tendon organs are
- A.
Chemoreceptors
- B.
Visceral receptors
- C.
Proprioceptors
- D.
Pain receptors
- E.
Nociceptors
Correct Answer
C. ProprioceptorsExplanation
Tendon organs are sensory receptors located in tendons that detect changes in muscle tension and provide information about the position and movement of the body. They are classified as proprioceptors because they contribute to proprioception, which is the sense of the body's position and movement in space. These receptors help the body maintain balance, coordination, and posture by providing feedback to the central nervous system about the length and tension of muscles.Rate this question:
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- 40.
This reflex shows the least synaptic delay
- A.
Polysynaptic reflex
- B.
Cross extension reflex
- C.
Withdrawal reflex
- D.
Tendon reflex
- E.
Flexor relfex
Correct Answer
D. Tendon reflexExplanation
The tendon reflex is the correct answer because it involves the least synaptic delay. In this reflex, the sensory neurons detect tension in a muscle tendon and send a signal to the spinal cord. The signal is then quickly relayed to motor neurons, causing the muscle to contract and relax. Since the reflex only involves a few synapses in the spinal cord, the transmission of the signal is faster compared to other reflexes that may involve more complex neural pathways.Rate this question:
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- 41.
The tendon reflex
- A.
Causes a muscle that isbeing stretched to contract
- B.
Makes the contralateral motor neurons contract
- C.
Makes the ipsilateral motor neurons relax
- D.
Prevents overcontraction of a muscle
- E.
Causes a tendon to contract
Correct Answer
D. Prevents overcontraction of a muscleExplanation
The tendon reflex prevents overcontraction of a muscle. When a muscle is being stretched, the tendon reflex is activated to protect the muscle from excessive contraction. This reflex causes the muscle to relax, preventing it from contracting too much and potentially causing damage. By inhibiting further contraction, the tendon reflex helps maintain the muscle's integrity and prevents it from overexerting or tearing.Rate this question:
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- 42.
A reflex where the sensory inout and motor output are on opposite sides of the spinal cord is called a(n) reflex arc
- A.
Intersegmental
- B.
Contralateral
- C.
Ipsilateral
- D.
Polysynaptic
- E.
Monosynaptic
Correct Answer
B. ContralateralExplanation
A reflex where the sensory input and motor output are on opposite sides of the spinal cord is called a contralateral reflex arc. This means that the sensory information is received on one side of the body and the motor response occurs on the opposite side. This type of reflex allows for quick and coordinated movements, as the sensory information can be processed and responded to rapidly.Rate this question:
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