The volume of blood ejected from the left ventricle into the aorta each minute is called the

Correct Answer: A

Rationale: Cardiac output is the total volume of blood pumped by the left ventricle per minute and is a key measure of heart performance.

Correct Answer: C

Rationale: The myocardium, the muscular layer, is the thickest part of the heart wall for pumping.

Correct Answer: B

Rationale: The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs, not from the left ventricle.

Correct Answer: C

Rationale: Ectopic beats originate from areas other than the SA node; thus, the SA node itself does not cause ectopic beats.

Correct Answer: A

Rationale: The QRS complex (often referred to as RS in simplified terms) on an ECG represents the depolarization of the ventricles, which initiates ventricular contraction.