Atrial fibrillation causes the atria to
A)contract forcefully.
B)expel the blood backwards.
C)wiggle instead of contract.
D)depolarize as a unit.

Question

Quizplus · Accepted Answer

Atrial fibrillation results in rapid and disorganized electrical activity in the atria, causing them to quiver or wiggle instead of contracting forcefully. This can lead to inefficient blood flow and an increased risk of blood clots, which may lead to stroke or other complications. The depolarization of the atria is not synchronized, and the atria do not contract as a coordinated unit, leading to the irregular heart rhythm associated with atrial fibrillation. Blood is also not expelled backward during atrial fibrillation, but instead may pool in the atria and increase the risk of clot formation.

Atrial Fibrillation Causes the Atria to