Regarding arrhythmias, which is TRUE?

Correct Answer: C

Rationale: In atrial fibrillation, the atria beat rapidly and irregularly, leading to variable ventricular response rates.

Correct Answer: A

Rationale: Atherosclerosis is the hardening and narrowing of arteries due to plaque buildup.

Correct Answer: B

Rationale: Frank-Starling's law states that an increase in end-diastolic volume stretches cardiac muscle fibers, resulting in a stronger contraction and greater stroke volume.

Correct Answer: D

Rationale: The skeletal muscle pump assists in venous return by compressing veins and pushing blood toward the heart.

Correct Answer: C

Rationale: The common iliac artery is part of the systemic circuit, delivering blood to the lower body.