The Nervous System: Structure and Control of Movement<BLURT>

The Nervous System: Structure and Control of Movement

1. The nervous system is divided into two major divisions A. central and parasympathetic.
B. autonomic and peripheral.
C. central and autonomic.
D. central and peripheral.

2. Which of the following is true of a sensory fiber? A. conduct information towards the CNS
B. are known as efferent fibers
C. innervate involuntary effector organs only
D. both a and b

3. The axon carries the electrical message A. towards the nerve cell.
B. away from the nerve cell.
C. to the CNS.
D. to/away from none of the above.

4. The discontinuous sheath that covers the outside of axons are A. Schwann cells.
B. nodes of Ranvier.
C. dendrites.
D. neurofibrils.

5. The resting membrane potential of a neuron is generally A. -40 to -75 mv.
B. 40 to 70 mv.
C. approximately 100 mv.
D. approximately 200 mv.

6. What mechanism ensures that there is little change in resting membrane potential? A. the diffusion of sodium into the cell
B. the diffusion of potassium out of the cell
C. sodium/potassium pump
D. all of the above

7. The first stage of the generation of a neural message is A. the formation of an action potential.
B. the change in polarity to become more negative.
C. the entry of potassium into the cell.
D. the entry of sodium into the cell.

8. Neurotransmitters that cause depolarization of membranes are called A. inhibitory transmitters.
B. receptors.
C. excitatory transmittors.
D. none of the above.

9. The summing of several EPSP's from a single presynaptic neuron over a short time period is called A. spatial summation.
B. temporal summation.
D. hyperpolarization.

10. An example of proprioreceptors that provide the CNS with information are A. muscle spindles.
B. golgi tendon organs.
C. joint receptors.
D. all of the above.

11. The withdrawal reflex results in A. contraction of extensor muscles on the side stimulated.
B. contraction of flexor muscles on the side stimulated.
C. inhibition of extensor muscles on the side not stimulated.
D. none of the above.

12. The storage of learned motor experiences is performed by the A. cerebellum.
B. cerebrum.
C. pons.
D. medulla.

13. Evidence exists to suggest that the control of movement in response to feedback from proprioceptors is carried out by the A. cerebellum.
B. cerebrum.
C. pons.
D. medulla.

14. The first step in performing a voluntary movement is thought to occur in the A. cerebellum.
B. brain stem.
C. sub cortical and cortical areas.
D. basal ganglia.

15. The sympathetic division of the autonomic nervous system has its preganglionic cell bodies in the A. brain stem and sacral spinal cord.
B. brain stem and thoracic spinal cord.
C. thoracic spinal cord and lumbar spinal cord.
D. lumbar spinal cord and sacral spinal cord.

16. The neurotransmitter released at the effector organ by the sympathetic nervous system is primarily A. acetylcholine.
B. epinephrine.
C. insulin.
D. norepinephrine.

17. Repolarization occurs due to A. increased permeability to potassium.
B. decreased permeability to sodium.
C. decreased permeability to potassium.
D. both a and b.

18. Synaptic transmission occurs when A. there is decreased neuronal permeability to sodium.
B. there is increased neuronal permeability to potassium.
C. sufficient amounts of neurotransmittors are released.
D. all of the above are true.

19. The maintenance of the body's internal environment is carried out by A. the parasympathetic nervous system.
B. the sympathetic nervous system.
C. the autonomic nervous system.
D. all of the above.

20. The motor cortex controls motor activity with the aid of input from the A. subcortical areas.
B. cerebral cortex.
C. cerebrum.
D. motor units.

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