Solved

When a Pacemaker Potential in the SA Node Reaches Threshold

Question 155

Multiple Choice

When a pacemaker potential in the SA node reaches threshold,


A) the permeability to K+ increases.
B) many voltage-gated Ca2+ channels open.
C) voltage-gated Ca2+ channels close.
D) resting membrane potential has been restored.
E) permeability of the cell does not change.

Correct Answer:

verifed

Verified

Unlock this answer now
Get Access to more Verified Answers free of charge

Related Questions

Q150: Which of the following areas of the

Q151: During the isovolumetric contraction period of the

Q152: Chemoreceptors sensitive to blood carbon dioxide levels

Q153: Which vessels transport blood to the right

Q154: If the SA node is nonfunctional, which

Q156: The period of isovolumetric contraction is immediately

Q157: An increase in extracellular Ca<sup>2+</sup> generally increases<br>A)

Q158: The inner lining of the pericardial cavity

Q159: What is the foramen ovale?<br>A) An opening

Q160: Depolarization of a cardiac muscle cell occurs