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Which coronary artery primarily supplies blood to the left ventricle and the interventricular septum?

A.

Left anterior descending artery

B.

Right coronary artery

C.

Posterior descending artery

D.

Circumflex artery

Answer and Explanation

The Correct Answer is A

A. Left anterior descending artery:
 The LAD artery is the main supplier of the anterior wall of the left ventricle and the interventricular septum, which is crucial for coordinated ventricular contraction. Occlusion can cause a large anterior myocardial infarction and severe left ventricular dysfunction.

B. Right coronary artery:
 The RCA primarily supplies the right atrium, right ventricle, and inferior wall of the left ventricle. It has a lesser role in anterior left ventricular perfusion.

C. Posterior descending artery:
 The PDA supplies the inferior septum and posterior left ventricle, not the anterior wall or majority of the left ventricle.

D. Circumflex artery:
 The circumflex artery supplies the lateral and posterior walls of the left ventricle. It does not supply the anterior wall or the main interventricular septum.


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Related Questions

Correct Answer is C

Explanation

A. Epicardium:
The epicardium is the outer layer of the heart that provides protection and contains blood vessels but is not responsible for contraction.

B. Pericardium:
The pericardium is a fibrous sac surrounding the heart that provides protection and reduces friction; it does not contain muscle tissue.

C. Myocardium:
The myocardium is the thick middle layer of cardiac muscle responsible for generating the force of contraction necessary for pumping blood throughout the body. It is metabolically active and highly dependent on coronary artery perfusion.

D. Endocardium:
The endocardium lines the interior of the heart chambers and valves; it provides a smooth surface for blood flow but does not contract.

Correct Answer is C

Explanation

A. To regulate heart rate:
Heart rate is controlled by the SA node and autonomic nervous system, not the pericardial sac.

B. To contract and assist with blood pumping:
The pericardium is non-contractile; it does not generate force to pump blood.

C. To provide a lubricated environment for the heart:
The pericardial sac contains pericardial fluid that reduces friction between the heart and surrounding structures during contraction and relaxation, protecting the heart from mechanical stress.

D. To store blood during diastole:
The pericardium does not store blood; ventricular chambers store blood transiently during diastole.

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