Which of the following best explains the mechanism called irritability?
A)A lower pacemaker site speeds up to take control of the heart.
B)The normal pacemaker changes its inherent rate.
C)The ventricles repolarize before they are ready.
D)The normal pacemaker slows down and gives up control.

Question

Quizplus · Accepted Answer

Irritability in the context of cardiac function refers to a situation where a lower pacemaker site within the heart increases its rate of firing, effectively taking over the rhythm control from the sinoatrial (SA) node, which is the heart's primary pacemaker. This can happen when the SA node is not functioning properly or when there is increased irritability or excitability in the lower pacemaker sites.

Which of the Following Best Explains the Mechanism Called Irritability