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

Question #1

An action potential;

A. has no repolarization phase

B. occurs when the local potential reaches threshold level

C. does not propagates across the plasma membrane

D. is an example of negative feedback

Question #2

Which of the following events will lead to depolarization?

A. an increase in Na+ ions diffusion to the intracellular 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 K+ ions in the extracellular fluid

Question #3

When repolarization of a neuron is complete the

A. neuron dies

B. neuron regenerates

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

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

Question #4

Action potentials are conducted more rapidly when transmission is;

A. from node to node on a myelinated axon

B. on a small diameter axon

C. on an unmyelinated axon

D. from internode to internode

Question #5

Graded potential in a neuron allows communication over only __________distance.

A. short

B. long

C. both short and long

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

Question #6

“Saltatory” conduction of an action potential means that;

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

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

C. the whole axon depolarizes at the same time

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

Question #7

The stage in an action potential that immediately follows depolarization is

A. repolarization

B. polarization

C. threshold

D. hyperpolarization