Based on the changes in the cardiovascular system caused by aging, what is the most likely reason an older adult is at an increased risk for a heart block that requires an electrical pacemaker?
A) Calcification of vessel walls
B) Lipid accumulation in the cardiovascular system
C) Decreased fibers in the bundle of His
D) Decreased number of pacemaker cells in the SA node

Question

Quizplus · Accepted Answer

Decreased fibers in the bundle of His can lead to a heart block, which is a condition in which the electrical impulses from the heart's atria do not reach the ventricles properly. This can cause the heart to beat too slowly or irregularly, which can lead to fainting, dizziness, or even death.

Based on the Changes in the Cardiovascular System Caused by Aging