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
Q47: Ventricular contraction begins at the
A) AV bundle.
B)
Q49: Action potentials pass from one myocardial cell
Q50: Which of the following phrases would apply
Q50: The cardiac electrical impulse normally begins spontaneously
Q51: Cardiac muscle cells
A)have smooth ER but no
Q52: The action potentials are slowed at the
Q53: Which of the following events occurs first?
A)threshold
B)depolarization
C)early
Q56: Which of the following is a function
Q56: Calcium channel blockers are frequently used to
A)increase
Q72: When comparing cardiac muscle cells and skeletal
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