Anatomy And Physiology Exam #3

96 Questions | Total Attempts: 1055

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Anatomy And Physiology Quizzes & Trivia

Hormones are special chemical messengers in the body that are created in the endocrine glands and have specific functions. These messengers control most major bodily functions, from hunger and even reproduction. Test how much you understood about the nerves, endocrine system and hormones by taking the review test below. All the best!


Questions and Answers
  • 1. 
    The cytoplasmic extensions that, together with the cell body, provide the main receptive surfaces for neurons are
    • A. 

      Neurofibrils

    • B. 

      Nissil fibers

    • C. 

      Axons

    • D. 

      Dendrites

  • 2. 
    Masses of myelinated nerve fibers appear
    • A. 

      White

    • B. 

      Gray

    • C. 

      Brown

    • D. 

      Transparent

  • 3. 
    Which of the following is a type of neuroglial cell?
    • A. 

      Bipolar neuron

    • B. 

      Multipolar neuron

    • C. 

      Ependymal cell

    • D. 

      All of the above

  • 4. 
    Which of the following lists the parts of a reflex arc in the correct sequence
    • A. 

      Receptor, sensory neuron, motor neuron, interneuron, effector

    • B. 

      Receptor, sensory neuron, interneuron, motor neuron, effector

    • C. 

      Effector, sensory neuron, receptor, interneuron, motor neuron

    • D. 

      Effector, receptor, sensory neuron, motor neuron, interneuron

  • 5. 
    Whena nerve fiber is polarized, the concentration of
    • A. 

      Sodium and potassium ions in higher on the inside of its membrane

    • B. 

      Sodium and potassium ions is higher on the outside of its membrane

    • C. 

      Sodium ions are higher on the inside, potassium ions are higher on the outside

    • D. 

      Sodium ions are higher on the outside, potassium ions higher on the inside

  • 6. 
    Saltatroy propagation
    • A. 

      Occurs only if the myelin sheath is continuous

    • B. 

      Occurs only if the nodes of ranvier are lacking

    • C. 

      Is faster than propagation on an unmyelinated fiber

    • D. 

      Is slower than propagation on an unmyelinated fiber

  • 7. 
    What produces myelin in the brain and spinal cord
    • A. 

      Schwann cells

    • B. 

      Axons

    • C. 

      Microlglia

    • D. 

      Oligodendrocites

  • 8. 
    The nervous system
    • A. 

      Detects changes in the internal or external environment

    • B. 

      Controls the movement of muscles and secretions of glands

    • C. 

      Integrates information from several sources and uses it to make an appropriate response

    • D. 

      All of the above

  • 9. 
    Which of the following ions passes through cell membranes of resting neurons most readily
    • A. 

      Potassium

    • B. 

      Sodium

    • C. 

      Calcium

    • D. 

      None of the above

  • 10. 
    If a resting potential becomes more negative, the membrane is said to be
    • A. 

      Depolarizing

    • B. 

      Hyperpolarizing

    • C. 

      Repolarizing

    • D. 

      Summating

  • 11. 
    What is the correct sequence of events that follow a threshold potential?(1)the membrane becomes depolarized(2)Sodium channels open and sodium ions diffuse inward(3)the membrane becomes repolarized(4)potassium channels open and potassium ions diffuse outward
    • A. 

      3,2,4,1

    • B. 

      2,1,4,3

    • C. 

      1,2,4,3

    • D. 

      4,1,3,2

  • 12. 
    When an action potential passes over the surface of a synaptic knob, the contents of the vesicles are released in response to the presence of
    • A. 

      Calcium ions

    • B. 

      Sodium ions

    • C. 

      Neurotransmitters

    • D. 

      Neuropeptides

  • 13. 
    Most neurons in the brain and spinal cord are
    • A. 

      Bipolar

    • B. 

      Unipolar

    • C. 

      Multipolar

    • D. 

      Nonpolar

  • 14. 
    If a neuron receives a series of stimuli whose effect is excitatory but subthreshold, the neuron is more excitable to incoming stimulation than before and is said to be
    • A. 

      Graded

    • B. 

      Amplified

    • C. 

      Facilitated

    • D. 

      Converged

  • 15. 
    The expected response to the triceps jerk reflex is
    • A. 

      Flexion of the forearm

    • B. 

      Extension of the forearm

    • C. 

      plantar flexion

    • D. 

      Plantar extension

  • 16. 
    A nerve cell membrane may become depolarized as a result of
    • A. 

      The sudden opening of leak channels for sodium ions

    • B. 

      The sudden opening of voltage regulated sodium channels

    • C. 

      The sudden opening of leak channels for potassium ions

    • D. 

      The sudden opening of voltage regulated potassium channels

  • 17. 
    Neurons are ____________, whereas neuroglial cells are __________.
    • A. 

      Nerve cells ; nerves

    • B. 

      Nerves ; nerve cells

    • C. 

      Structural and functional unit sof the nervous system; accessory cells in the nerve tissue

    • D. 

      Cells that conduct nerve impulses, fill spaces and support parts; cells that connect nerve tissue to surrounding organs

  • 18. 
    The process of transmitting a nerve impulse from one neuron to another involves a
    • A. 

      Nerve impulse stimulating presynaptic dendrites to release a neurotrasmitter in to a synaptic cleft

    • B. 

      Nerve impulse stimulating presynaptic axons to release a neurotransmitter into a synaptic cleft

    • C. 

      Neurotransmitter traveling from presynaptic dendrites across a synapse to postsynaptic axons or a cell body

    • D. 

      Neurotransmitter traveling from postsynaptic axons across a synapse to pretsynaptic dendrites or a cell body

  • 19. 
    Which if the following cells is only found in the PNS? (peripheral)
    • A. 

      Oligodendrocyte

    • B. 

      Astrocyte

    • C. 

      Micrglial cells

    • D. 

      Scwann cells

  • 20. 
    Skeltal muscle contration is under the control of the
    • A. 

      Autonomic nervous system

    • B. 

      Somatic nervous system

    • C. 

      Parasympathetic nervous system

    • D. 

      Sympathetic nervous system

  • 21. 
    Which of the following in under voluntary control of the nervous system
    • A. 

      Smooth muscles

    • B. 

      Glands

    • C. 

      Cardiac muscle

    • D. 

      Skeletal muscle

  • 22. 
    Clusters of neuron cell bodies are called
    • A. 

      Soma

    • B. 

      Axons

    • C. 

      Ganglia

    • D. 

      Nuclei

  • 23. 
    Which of the following cells is not part of the CNS?(central)
    • A. 

      Ependymal cells

    • B. 

      Astrocytes

    • C. 

      Satellite cells

    • D. 

      Microglia

  • 24. 
    When astimulus is sufficently great enough to chenge the membrane potential and propagate an axon potential, it is
    • A. 

      EPSP

    • B. 

      IPSP

    • C. 

      Threshold

    • D. 

      Tetanus

  • 25. 
    Axon branches are called collaterals
    • A. 

      True

    • B. 

      False

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