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Cardiovascular System: Cardiac Action Potential

Interactive Physiology® Quiz: Cardiovascular System: Cardiac Action Potential

This activity contains 10 questions.

Question 1
1 Action potentials generated by the autorhythmic cells spread to the contractile cells through what in the membrane?
 
End of Question 1


Question 2
2 There are three channels essential for generating an action potential in autorhythmic cells. Which of the following ion channels have ions that move out of the cell?
 
End of Question 2


Question 3
3 If the sodium or fast calcium channels are open, the inside of the cell would become relatively more:
 
End of Question 3


Question 4
4 The pacemaker potential (unstable resting membrane potential) in the SA node (an autorhythmic cell) is caused by decreased efflux of what ion?
 
End of Question 4


Question 5
5 When threshold is reached at the SA node (an autorhythmic cell), what channels open, causing further depolarization of the membrane?
 
End of Question 5


Question 6
6 Repolarization of an autorhythmic cell is caused by increased permeability of the membrane to what ion?
 
End of Question 6


Question 7
7 Where is the calcium stored in contractile cells?
 
End of Question 7


Question 8
8 What causes action potentials in contractile cells?
 
End of Question 8


Question 9
9 The depolarization phase of contractile cells is caused by the opening of what voltage-gated channels?
 
End of Question 9


Question 10
10 The repolarization phase of contractile cells is delayed by the plateau phase. The opening of what voltage-gated channels is responsible for the plateau phase?
 
End of Question 10


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