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

Question #1

An action potential;

A. is an example of negative feedback

B. has no repolarization phase

C. occurs when the local potential reaches threshold level

D. does not propagates across the plasma membrane

Question #2

Which of the following events will lead to depolarization?

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

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

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

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

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. neuron regenerates

C. neuron dies

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

Question #4

Action potentials are conducted more rapidly when transmission is;

A. from internode to internode

B. from node to node on a myelinated axon

C. on a small diameter axon

D. on an unmyelinated axon

Question #5

Graded potential in a neuron allows communication over only __________distance.

A. long

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

C. both short and long

D. short

Question #6

“Saltatory” conduction of an action potential means that;

A. the whole axon depolarizes at the same time

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

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

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. hyperpolarization

B. threshold

C. repolarization

D. polarization