Multiple Choice
When a pacemaker potential in the SA node reaches threshold,
A) the permeability to K+ ions increases.
B) many voltage-gated Ca2+ channels open.
C) voltage-gated Ca2+ channels close.
D) RMP has been restored.
E) permeability of the cell does not change.
Correct Answer:
Verified
Correct Answer:
Verified
Q39: A knowledge of heart location would NOT
Q61: Cardiac muscle cells<br>A)have smooth ER but no
Q64: Which of the following would result from
Q66: In a physiology lab,the students designed an
Q67: The baroreceptor reflex would cause which of
Q68: What is the importance of the delay
Q83: The pericardial sac is lined with<br>A) fibrous
Q94: The long refractory period observed in cardiac
Q133: The peripheral chemoreceptors that respond to oxygen
Q142: The adult heart averages _ grams.<br>A) 100-200<br>B)