Anatomy and Physiology

Answers to Nervous System Sample Questions

 

1.         Which of the following is TRUE about a neuron at rest?

 

A.        The cytosol is positive relative to the outside

B.        Na+ concentrations are higher inside

C.        The inside of the neuron must be polarized to fire an action potential

D.        K+ channels are leaky

E.         Na+ channels are open

 

2.         Which of the following factors does not contribute to ion selectivity?

 

            A.        Channel diameter

            B.        Chemical properties of amino acids lining the channel

            C.        Microenvironmental conditions affecting the channel

            D.        Lipid solubility

            E.         C & D

 

3.         Action potentials can occur at all of the following sites Except:

 

A.        Nodes of Ranvier

B.        Axon Hillock

C.        Along the length of the axon

D.        Axon terminal

E.         Action potential can occur at all of the above sites

 

4.         Which of the following refers to the amount of depolarizing current required to initiate an action potential?

 

            A.        Threshold

            B.        Generator potential

            C.        Resting potential

            D.        Depolarizing current

            E.         Action potential

 

5.         Which feature of a neuron does the Na+/K+ pump make possible?

 

            A.        Saltatory conductance

            B.        Selective permeability

            C.        The refractory period

            D.        The resting potential

            E.         Axonal conductance

 

6.         When a membrane is at rest, what attracts K+ ions to the outside of the neuron?

 

            A.        Concentration gradient

            B.        Electrical gradient

            C.        Hydrogen bonding

            D.        A & B

            E.         A, B & C

 

7.         Of the following, which current is responsible for the rising phase of the action potential?

 

            A.        Na+ influx

            B.        Na+ efflux

            C.        K+ influx

            D.        K+ efflux

            E.         None of the above

 

8.         In regards to the anatomy of the nervous system, which of the following is Not True?

 

            A.        The meninges include a fluid-filled space between the pia mater and the arachnoid membrane.

            B         The cytoarchitecture of all parts of the cerebral cortex includes lamina and columns.

            C.        Substantia have less defined boundaries than nuclei.

            D.        Lipids do not readily enter the brain due to tight junctions between epithelial cells in capillary walls.

            E.         The choroid plexus is comprised of specialized secretory cells that produce cerebral spinal fluid.

 

9.         Which of the following terms can be used to refer to axons that connect structures on different sides of the brain?

 

            A.        Fibers

            B.        Tracts

            C.        Bundles

            D.        Commissures

            E.        C & D

 

10.       Which of the following is NOT part of the brainstem?

 

            A.        Cerebellum

            B.        Pons

            C.        Medulla

            D.        Midbrain

            E.         A & D

 

11.       Relative to the central sulcus, which of the following areas of the brain is most caudal?

 

            A.        Precentral gyrus

            B.        Temporal lobe

            C.        Postcentral gyrus

            D.        Parietal lobe

            E.        Parieto-occipital sulcus

 

12.       Which of the following properties permits axons but not cell bodies to fire action potentials?

 

            A.        Axons have unique Na+ and K+ channels

            B.        Axons have Na+ and K+ channels in high density

            C.        Axons have myelin

            D.        The sodium-potassium pump is uniquely located in axons

            E.         Cell body Na+ channels do not deinactivate when polarized

 

13.       The cerebral hemispheric lobe that is most anterior has which of the following functions?

 

            A.        Movement

            B.        Audition

            C.        Vision

            D.        Olfaction

            E.         Somatic sensation

 

14.       In regards to the diencephalons, which of the following is NOT TRUE?

 

            A.        The thalamus relays sensory information to the cortex

            B.        The hypothalamus controls autonomic reflexes

            C.        The hypothalamus control endocrine function

            D.        The pineal gland is part of the epithalamus

            E.         CSF is produced by the choroids plexus