Once an action potential occurs at the axon hillock, why is it replicated at the next node of Ranvier?
A. Incoming sodium ions diffuse to the next node, pushing potassium ions ahead as well, and threshold will be attained.
B. The sodium-potassium pumps at the next node recapture sufficient potassium to reach threshold and trigger another action potential.
C. The action potential drifts passively down the length of the entire axon.
D. The occurrence of an action potential at the axon hillock attracts potassium from the adjacent node, and threshold will be attained.
Answer: A
You might also like to view...
The sympathetic division of the autonomic nervous system:
A. calms the body down B. aids in digestion C. secretes a group of hormones called corticoids D. prepares the body to deal with danger
Another phrase for “generalizability” is _____.
A. internal validity B. external validity C. positive psychology D. negative psychology
Clinicians who view personality disorders as extremes of normal personality rather than as ________ have criticized the way the DSM classifies personality disorders.
A. medical conditions B. biologically based traits C. separate categories of disorders D. impaired functioning
The ______ is a flexible tissue that allows us to focus on objects at different distances.
A. cornea B. lens C. pupil D. iris