Dr Gawad - CNS - Mid Moduel Exam Training
32 MCQs in 35 min
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dr Gawad
- 1.
Parasympathetic function include
- A.
A stimulation of heart rate and force of contraction
- B.
Allowing the body to cope with an external threat
- C.
Constriction of bronchioles
- D.
Glycogenolysis and lipolysis
Correct Answer
C. Constriction of bronchiolesExplanation
The correct answer is "constriction of bronchioles." Parasympathetic function includes the constriction of bronchioles, which helps to regulate airflow in the respiratory system. This narrowing of the bronchioles helps to control the amount of air entering the lungs, allowing for more efficient gas exchange.Rate this question:
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- 2.
Generallized sympathetic activity is characterized by all of the following EXCEPT
- A.
Contraction of the radial muscle of the iris
- B.
Increased secretion of catecholamines
- C.
Lipolysis in adipose tissue
- D.
Relaxation of sphincteric smooth muscle in the alimentary tract
Correct Answer
D. Relaxation of sphincteric smooth muscle in the alimentary tractExplanation
Generalized sympathetic activity is characterized by several physiological responses, including contraction of the radial muscle of the iris, increased secretion of catecholamines, and lipolysis in adipose tissue. However, relaxation of sphincteric smooth muscle in the alimentary tract is not a characteristic of sympathetic activity. Instead, sympathetic activity typically leads to the contraction of smooth muscle in the alimentary tract, which can reduce digestion and slow down the movement of food through the digestive system.Rate this question:
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- 3.
Acetylcholine is released from all the following fibers EXCEPT
- A.
All preganglionic parasympathetic fibers
- B.
All preganglionic sympathetic fibers
- C.
All postganglionic sympathetic fibers
- D.
Preganglionic fibers suppling the adrenal medulla
Correct Answer
C. All postganglionic sympathetic fibersExplanation
Acetylcholine is a neurotransmitter that is released from preganglionic fibers of both the parasympathetic and sympathetic nervous systems. It is also released from preganglionic fibers that supply the adrenal medulla. However, postganglionic sympathetic fibers release norepinephrine, not acetylcholine. Therefore, the correct answer is "all postganglionic sympathetic fibers."Rate this question:
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- 4.
The center of autonomic reflex arc is present in
- A.
Autonomic ganglia
- B.
Lateral horn cell
- C.
Anterior horn cell
- D.
Posterior horn cell
Correct Answer
B. Lateral horn cellExplanation
The correct answer is lateral horn cell. The center of the autonomic reflex arc is located in the lateral horn cell. This cell is responsible for receiving and processing signals from sensory neurons and sending out motor signals to control involuntary functions of the body. The lateral horn cell is part of the autonomic nervous system, which regulates activities such as heart rate, digestion, and breathing.Rate this question:
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- 5.
Noradrenaline is released at
- A.
Motor end plate
- B.
Sympathetic ganglia
- C.
End of most postsynaptic sympathetic fibers
- D.
End of most postganglionic parasympathetic fibers
Correct Answer
C. End of most postsynaptic sympathetic fibersExplanation
Noradrenaline is released at the end of most postsynaptic sympathetic fibers. This neurotransmitter is involved in the sympathetic nervous system's fight-or-flight response. When released, noradrenaline binds to adrenergic receptors on target cells, activating a physiological response. The release of noradrenaline at the end of these fibers allows for the transmission of signals from the sympathetic nervous system to target tissues and organs, coordinating the body's response to stress or danger.Rate this question:
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- 6.
The parasympathetic nervous system is characterized by the presence of terminal ganglia near the
- A.
Organs and by short postganglionic fibers
- B.
Organs and long postganglionic fibers
- C.
Spinal cord and by short postganglionic fibers
- D.
Splanchnic nerves
Correct Answer
A. Organs and by short postganglionic fibersExplanation
The parasympathetic nervous system is characterized by the presence of terminal ganglia near the organs and by short postganglionic fibers. This means that the ganglia, which are clusters of nerve cell bodies, are located close to the target organs. Additionally, the postganglionic fibers, which are the nerve fibers that extend from the ganglia to the organs, are relatively short. This arrangement allows for quick and localized control of organ function by the parasympathetic nervous system.Rate this question:
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- 7.
Which autonomic receptors mediate secretion of epinephrine by the adrenal medulla
- A.
Adrenergic alpha 1 receptors
- B.
Adrenergic beta 1 receptors
- C.
Cholinergic muscarinic receptors
- D.
Cholinergic nicotinic receptors
Correct Answer
D. Cholinergic nicotinic receptorsExplanation
Cholinergic nicotinic receptors mediate the secretion of epinephrine by the adrenal medulla. These receptors are activated by acetylcholine, which leads to the release of epinephrine. Epinephrine is a hormone that plays a crucial role in the body's response to stress and helps regulate various physiological processes. Therefore, activation of cholinergic nicotinic receptors is essential for the secretion of epinephrine by the adrenal medulla.Rate this question:
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- 8.
Stimulation of the vagus nerve causes
- A.
Inhibition of the internal anal sphincter
- B.
Secretion and vasodilation in the salivary glands
- C.
Mucous secretion from the bronchial mucosal cells
- D.
Contraction of the splenic capsule
Correct Answer
C. Mucous secretion from the bronchial mucosal cellsExplanation
Stimulation of the vagus nerve causes mucous secretion from the bronchial mucosal cells. The vagus nerve is responsible for the parasympathetic innervation of the lungs and bronchial tubes. When the vagus nerve is stimulated, it activates the bronchial mucosal cells to secrete mucus. This helps to lubricate the airways and protect them from irritants, pathogens, and foreign particles. The increased mucous secretion can also aid in the clearance of mucus and improve respiratory function.Rate this question:
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- 9.
Which of the following responses is mediated by parasympathetic muscarinic receptors
- A.
Dilatation of bronchiolar smooth muscle
- B.
Erection
- C.
Ejaculation
- D.
Contraction of gastrointestinal sphincters
Correct Answer
B. ErectionExplanation
Erection is mediated by parasympathetic muscarinic receptors. When these receptors are activated, they cause the release of nitric oxide, which leads to relaxation of smooth muscles in the blood vessels of the penis. This relaxation allows for increased blood flow into the penis, resulting in an erection.Rate this question:
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- 10.
The sympathetic nervous system is characterized by all of the following EXCEPT
- A.
Has longer post ganglionic fibers than preganglionic ones
- B.
Is catabolic
- C.
Produces generalized effects
- D.
Has no divergence in autonomic ganglia
Correct Answer
D. Has no divergence in autonomic gangliaExplanation
The sympathetic nervous system is characterized by longer postganglionic fibers than preganglionic ones, which allows for a greater distribution of signals. It is also catabolic, meaning it promotes the breakdown of molecules for energy production. Additionally, the sympathetic system produces generalized effects throughout the body, such as increased heart rate and dilated pupils. However, it does have divergence in autonomic ganglia, meaning that preganglionic fibers can synapse with multiple postganglionic neurons, allowing for amplification and distribution of signals.Rate this question:
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- 11.
As regard refered pain, it can be explained by
- A.
Muller's law
- B.
Peripheral senstization
- C.
Convergence projection theory
- D.
Primary hyperalgesia
Correct Answer
C. Convergence projection theoryExplanation
The convergence projection theory suggests that referred pain occurs when sensory nerves from different areas of the body converge onto the same neurons in the spinal cord. This convergence leads to confusion in the brain, causing the pain to be perceived in a different location than its actual source. This theory explains why pain from internal organs, for example, can be felt in distant areas of the body.Rate this question:
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- 12.
The somatosensory association area is
- A.
The center that recieves fine touch sensation
- B.
Located in the temporal and occipital lobe
- C.
Concerned with a meaning of sensations
- D.
The primary area for perception of pain
Correct Answer
C. Concerned with a meaning of sensationsExplanation
The somatosensory association area is responsible for processing and interpreting sensory information related to touch, temperature, and proprioception. It is located in the parietal lobe, not the temporal and occipital lobes. This area helps to give meaning to sensations, allowing us to recognize objects by touch and understand their significance. It is not specifically associated with fine touch sensation or the perception of pain, which are functions of other areas in the somatosensory cortex.Rate this question:
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- 13.
Regarding Somatosensory cortical areas, which is false:
- A.
Somatosensory area I receives sensory radiation from ipsilateral thalamus
- B.
Astereognosis occurs due to lesion in somatosensory area I
- C.
Body representation in somatosensory area II is sharply localized
- D.
Somatic sensory association area is important for perceiving complex sensations
Correct Answer
C. Body representation in somatosensory area II is sharply localizedExplanation
Body representation in somatosensory area II is not sharply localized. Unlike somatosensory area I, which has a precise representation of the body, somatosensory area II has a more diffuse and less precise representation. This means that the body parts are not as clearly defined in somatosensory area II as they are in somatosensory area I.Rate this question:
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- 14.
All of the following are correct regarding neurotransmitter EXCEPT
- A.
Released into the blood in response to a stimulus
- B.
Produced by and stored in presynaptic neurons
- C.
Binds to special receptors on post synaptic membrane
- D.
Eah neuron usually release only one type of neurotransmitter
Correct Answer
A. Released into the blood in response to a stimulusExplanation
Neurotransmitters are chemical messengers that transmit signals between neurons. They are produced and stored in presynaptic neurons and bind to special receptors on the postsynaptic membrane to transmit the signal. However, neurotransmitters are not released into the blood in response to a stimulus. Instead, they are released into the synapse, the small gap between neurons, to transmit signals across the neural network.Rate this question:
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- 15.
In which of the following ascending pathways do the second order neurons decussate within the spinal cord
- A.
Fasciculus cuneate
- B.
Dorsal spinocerebellar tract
- C.
Fasiculus gracilis
- D.
Ventral spinothalamic tract
Correct Answer
D. Ventral spinothalamic tractExplanation
The ventral spinothalamic tract is the ascending pathway in which the second order neurons decussate within the spinal cord. This means that the sensory information from one side of the body crosses over to the opposite side of the spinal cord before ascending to the brain. The other pathways listed (fasciculus cuneate, dorsal spinocerebellar tract, and fasciculus gracilis) do not involve decussation within the spinal cord.Rate this question:
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- 16.
It is correct to say
- A.
Thermoreceptors stop discharging above 45°C
- B.
Fine grades of temprature are transmitted by the gracile and cuneat tracts
- C.
Tonic receptors include tactile receptors
- D.
The coding of sensory information includes the disrimination of modality, locality and intensity of that sensation.
Correct Answer
D. The coding of sensory information includes the disrimination of modality, locality and intensity of that sensation.Explanation
The answer is correct because the coding of sensory information indeed involves the discrimination of modality, locality, and intensity of the sensation. Modality refers to the type of sensation, such as touch, temperature, or pain. Locality refers to the specific area or location where the sensation is felt. Intensity refers to the strength or magnitude of the sensation. These three factors are essential in encoding sensory information and allowing us to perceive and interpret different sensations accurately.Rate this question:
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- 17.
About referred pain. All of the following are true EXCEPT
- A.
It is explained by the convergence facilitation theory
- B.
It always accompanies cutaneous pain
- C.
It is a major manifestation of visceral pain
- D.
It is felt in the somatic structure (dermatome) innervated by the same dorsal root that innervates the diseases viscous.
Correct Answer
B. It always accompanies cutaneous painExplanation
Referred pain refers to the phenomenon where pain is felt in a different area of the body than the actual source of the pain. It is not always accompanied by cutaneous pain, meaning pain on the skin or superficial tissues. Referred pain can occur without any cutaneous pain, and this statement contradicts that fact.Rate this question:
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- 18.
Which of the following is true about the gate theory in the spinal cord
- A.
The gate is the synapse between the second and third order neurons of the pain pathway
- B.
When the gate is closed both the pain and touch pathways cannot discharge to the thalamus
- C.
It involves inhibition of pain signals by tactile stinulation of a skin surface
- D.
Acceleration of the heart after haemorrhage.
- E.
It involves release of acetylcholine from the brain stem to the soinal cord
Correct Answer
C. It involves inhibition of pain signals by tactile stinulation of a skin surfaceExplanation
The gate theory in the spinal cord involves the inhibition of pain signals by tactile stimulation of a skin surface. This means that when the gate is closed, both the pain and touch pathways cannot send signals to the thalamus, resulting in a decrease in pain perception. This theory suggests that by stimulating the skin with touch or pressure, it can help alleviate or reduce the sensation of pain.Rate this question:
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- 19.
Stimulation of of the medial part of the right primary somatosensory area will result in a sensation referred to
- A.
The right hand
- B.
The left foot
- C.
The right foot
- D.
The left hand
Correct Answer
B. The left footExplanation
Stimulation of the medial part of the right primary somatosensory area will result in a sensation referred to the left foot. This is because the primary somatosensory area is responsible for processing sensory information from different parts of the body. The right primary somatosensory area specifically receives input from the left side of the body, meaning that stimulation in this area will result in a sensation on the opposite side of the body. Therefore, stimulating the medial part of the right primary somatosensory area will result in a sensation in the left foot.Rate this question:
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- 20.
Which of the following is a property of the generator potential
- A.
It can be propagated along the sensory nerve fiber
- B.
It obeys all or none rule
- C.
Has a long refractory period
- D.
Becomes larger in amplitude if stimulus strenght increases
Correct Answer
D. Becomes larger in amplitude if stimulus strenght increasesExplanation
The generator potential is a graded potential that occurs in sensory neurons in response to a stimulus. It is directly proportional to the strength of the stimulus, meaning that it becomes larger in amplitude as the stimulus strength increases. This property allows the generator potential to provide information about the intensity of the stimulus.Rate this question:
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- 21.
Intracranial headache may result from all of the following clinical causes EXCEPT
- A.
Decreased CSF pressure
- B.
Spasm of scalp muscles
- C.
Distension of dura vinous sinuses
- D.
Pressure upon tentorium cerecri
Correct Answer
B. Spasm of scalp musclesExplanation
Intracranial headache may result from decreased CSF pressure, distension of dura vinous sinuses, and pressure upon tentorium cerecri. However, spasm of scalp muscles is not a clinical cause of intracranial headache.Rate this question:
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- 22.
Lesion of the dorsal column system most likely affect
- A.
Fine touch
- B.
Itch and tickle
- C.
Pain sensation
- D.
Temprature sensation
Correct Answer
A. Fine touchExplanation
A lesion of the dorsal column system is most likely to affect fine touch. The dorsal column system is responsible for transmitting sensory information related to fine touch, proprioception, and vibration. If there is a lesion or damage to this system, it can result in a loss or impairment of fine touch sensation. Itch and tickle sensations are not primarily transmitted through the dorsal column system, but rather through other sensory pathways. Pain and temperature sensations are primarily transmitted through different pathways, such as the spinothalamic tract.Rate this question:
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- 23.
Regarding spinal cord gate theory of pain, which is true:
- A.
Inhibitory neuron (which is relaying on the second order neuron of the lateral spinothalamic tract) is tonically inactive
- B.
Stimulation of nearby A myleinated fibers will activate second order neuron of the near spinothalamic pathway by inhibition of the interneuron.
- C.
Stimulation of the sensory C fiber afferent of the lateral spinothalamic tract will inhibit the tonically active inhibitory interneuron.
- D.
None of the above
Correct Answer
C. Stimulation of the sensory C fiber afferent of the lateral spinothalamic tract will inhibit the tonically active inhibitory interneuron.Explanation
According to the spinal cord gate theory of pain, the correct statement is that stimulation of the sensory C fiber afferent of the lateral spinothalamic tract will inhibit the tonically active inhibitory interneuron. This theory suggests that the transmission of pain signals can be modulated by the activity of inhibitory interneurons in the spinal cord. Stimulation of the C fibers, which are associated with pain transmission, can inhibit these inhibitory interneurons, allowing pain signals to be transmitted to the brain. Therefore, this statement aligns with the principles of the spinal cord gate theory of pain.Rate this question:
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- 24.
About hyperalgesia which of the following is true:
- A.
The pain receptor is rapidly adapting.
- B.
1ry hyperalgesia is due to central facilitation.
- C.
Secondary hyperalgesia is due to receptor hypersenstivity.
- D.
Area of flare is due to release of histamine from injured area
Correct Answer
D. Area of flare is due to release of histamine from injured areaExplanation
The area of flare is due to the release of histamine from the injured area. Histamine is a chemical released by mast cells in response to tissue injury or inflammation. It causes vasodilation and increased permeability of blood vessels, leading to redness and swelling in the surrounding area. This release of histamine is responsible for the characteristic flare response seen in hyperalgesia, where the area around the injured site becomes hypersensitive to pain.Rate this question:
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- 25.
About the true visceral pain:
- A.
It is transmitted by somatic nerve fibers
- B.
Pain from the testis is conducted through dorsal column leminiscus pathway
- C.
Cardiac pain is conducted through sympathetic nerve fibers.
- D.
It is sharply localized.
Correct Answer
C. Cardiac pain is conducted through sympathetic nerve fibers.Explanation
Cardiac pain is conducted through sympathetic nerve fibers. This means that the pain signals from the heart are transmitted through the sympathetic nervous system, which is responsible for the body's fight-or-flight response. This pathway allows for the rapid transmission of pain signals, leading to the characteristic sharp and intense pain experienced during a cardiac event. The other statements provided in the question are incorrect and do not accurately describe visceral pain.Rate this question:
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- 26.
Regarding cutaneous pain, which of the following is true:
- A.
Fast immediate cutaneous pain is transmitted by paleospinothalameic tract
- B.
Neospinothalamic tract is connected to the reticular formation
- C.
Sever cutaneous pain associated with hypotension
- D.
Lateral spinothalamic tract is specific only for cutaneous pain transmission
Correct Answer
C. Sever cutaneous pain associated with hypotensionExplanation
Severe cutaneous pain is associated with hypotension. This means that when a person experiences intense pain on their skin, it can lead to a decrease in blood pressure. This is because the body's response to severe pain includes the release of certain chemicals that can cause blood vessels to dilate and blood pressure to drop. This physiological response is a protective mechanism that diverts blood flow to vital organs and tissues in order to ensure their survival.Rate this question:
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- 27.
Which of the following is not an unconscious kinesthetic sensation:
- A.
Sense of muscle tone.
- B.
Momentary state of muscle contraction.
- C.
Muscle length
- D.
Sense of joint movement.
Correct Answer
D. Sense of joint movement.Explanation
The sense of joint movement is not an unconscious kinesthetic sensation because it is a conscious perception of the position and movement of our joints. Unlike muscle tone, muscle contraction, and muscle length, which are all unconscious sensations, the sense of joint movement requires conscious awareness and perception.Rate this question:
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- 28.
The gracile pathway:
- A.
Transmits unconscious kinesthetic sensation
- B.
Its afferent is thin slow afferent
- C.
It runs in the spinal cord medially to the cuneat tract
- D.
Its transmission is perceived by the thalamus
Correct Answer
C. It runs in the spinal cord medially to the cuneat tractExplanation
The gracile pathway is a neural pathway that transmits unconscious kinesthetic sensation. It is characterized by thin slow afferent fibers and runs in the spinal cord medially to the cuneate tract. The transmission of sensory information through the gracile pathway is perceived by the thalamus.Rate this question:
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- 29.
Regarding the ventral spinothalamic tract, which of the following is not true:
- A.
Its afferent fiber is type C fiber
- B.
The crossing of the tract to the midline is mainly in the second order neuron
- C.
It transmits crude touch.
- D.
The main centre of this tract is the thalamus
Correct Answer
D. The main centre of this tract is the thalamusExplanation
The ventral spinothalamic tract is responsible for transmitting pain and temperature sensations. It consists of type A-delta and type C fibers, not just type C fibers. The crossing of the tract to the midline mainly occurs in the first-order neuron, not the second-order neuron. It transmits crude touch, but its main function is to transmit pain and temperature sensations. The main center of this tract is the brainstem, specifically the medulla and the pons, not the thalamus.Rate this question:
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- 30.
About receptor potential which of the following is true:
- A.
It obeys the all or none rule.
- B.
It is a form of partial depolarization.
- C.
Its absolute refractory period is too short
- D.
It is blocked by local anesthetics.
Correct Answer
B. It is a form of partial depolarization.Explanation
The correct answer is "It is a form of partial depolarization." Receptor potential refers to the graded electrical potential that occurs in sensory receptors in response to a stimulus. It is a form of partial depolarization because it does not always reach the threshold for action potential generation. Instead, the magnitude of the receptor potential is directly proportional to the intensity of the stimulus, allowing for the encoding of different stimulus strengths.Rate this question:
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- 31.
Sensory ataxia is due to lesion of
- A.
Dorsal colum
- B.
;ateral colum
- C.
Ventral column
- D.
Posterolateral column
Correct Answer
A. Dorsal columExplanation
Sensory ataxia is a condition characterized by a loss of coordination and balance due to a lesion in the dorsal column of the spinal cord. The dorsal column is responsible for transmitting sensory information, such as proprioception (awareness of body position) and vibration sense, to the brain. When this column is damaged, it can result in the inability to accurately perceive and interpret sensory information, leading to difficulties in coordinating movements and maintaining balance.Rate this question:
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- 32.
Primary motor area (area 4), which is false
- A.
The body is represented in an inverted manner
- B.
Cortical representation of any part of the body in area 4 is directly proportional to its size
- C.
It is an area of high excitability
- D.
It contains large pyramidal
Correct Answer
B. Cortical representation of any part of the body in area 4 is directly proportional to its size -
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Mar 20, 2023Quiz Edited by
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