Prince George Community College » Biology » Bio 2050 - Anatomy and Physiology » Fall 2021

Question #1

An action potential;

A. has no repolarization phase

B. does not propagates across the plasma membrane

C. is an example of negative feedback

D. occurs when the local potential reaches threshold level

Question #2

Which of the following events will lead to depolarization?

A. an increase in K+ ions in the extracellular fluid

B. an increase in the rate of diffusion of K+ ions from cells

C. a decrease in K+ ions in the extracellular fluid

D. an increase in Na+ ions diffusion to the intracellular fluid

Question #3

When repolarization of a neuron is complete the

A. original polarity of the neuron is restored and resting membrane potential is reestablished

B. cell no longer has a potential difference across its membrane

C. neuron dies

D. neuron regenerates

Question #4

Action potentials are conducted more rapidly when transmission is;

A. from node to node on a myelinated axon

B. from internode to internode

C. on an unmyelinated axon

D. on a small diameter axon

Question #5

Graded potential in a neuron allows communication over only __________distance.

A. both short and long

B. long

C. short

D. graded potential doesn’t participate in cell to cell communication

Question #6

“Saltatory” conduction of an action potential means that;

A. once one action potential is created, it moves down the axon

B. the whole axon depolarizes at the same time

C. one action potential stimulates the production of a new action potential at the adjacent site

D. an action potential is conducted from one node of Ranvier to the next node

Question #7

The stage in an action potential that immediately follows depolarization is

A. hyperpolarization

B. repolarization

C. polarization

D. threshold