Multiple Choice
Pacemaker activity refers to spontaneous depolarizations resulting from
A) shifts in passive ionic fluxes accompanying
B) cyclical changes in Na+-K+ pump activity
C) automatic changes in channel permeability
D) both a and b
E) both a and c
Correct Answer:

Verified
Correct Answer:
Verified
Q270: Myoglobin<br>A)can store small amounts of O₂<br>B)increases the
Q271: A functional syncytium<br>A)is a pair of antagonistic
Q272: Describe how glycolysis, creatine, and mitochondria are
Q273: _ ions function as the intracellular signal
Q274: Indicate which of the characteristics in question
Q276: Match muscle type with the correct characteristics.<br>a.voluntary,
Q277: Actin<br>A)has ATPase activity<br>B)are spherical<br>C)forms a helical chain
Q278: Picking up a book at a constant
Q279: Indicate which of the characteristics in question
Q280: Conscious initiation of muscle contraction is controlled