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Where is the mitral valve located, and what is its primary function?

A.

Between the left ventricle and aorta; prevents backflow of blood into the left ventricle

B.

Between the right atrium and right ventricle; prevents backflow of blood into the right atrium

C.

Between the right ventricle and pulmonary artery; prevents backflow of blood into the right ventricle

D.

Between the left atrium and left ventricle; prevents backflow of blood into the left atrium

Answer and Explanation

The Correct Answer is D

A. Between the left ventricle and aorta; prevents backflow of blood into the left ventricle:
 This describes the aortic valve, not the mitral valve. The aortic valve prevents backflow from the aorta into the left ventricle. Confusing these can lead to misinterpretation of murmurs or heart sounds.

B. Between the right atrium and right ventricle; prevents backflow of blood into the right atrium:
 This describes the tricuspid valve, which is on the right side of the heart. The mitral valve is on the left side.

C. Between the right ventricle and pulmonary artery; prevents backflow of blood into the right ventricle:
 This describes the pulmonic valve, which is located at the right ventricular outflow tract, not the mitral valve.

D. Between the left atrium and left ventricle; prevents backflow of blood into the left atrium:
 The mitral valve (also called the bicuspid valve) is located between the left atrium and left ventricle. Its primary function is to allow unidirectional blood flow into the left ventricle during diastole and prevent regurgitation into the left atrium during systole, maintaining efficient cardiac output.


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Related Questions

Correct Answer is D

Explanation

A. The circumflex artery supplies the atrioventricular node:
In most individuals, the AV node is supplied by the right coronary artery, not the circumflex. The circumflex supplies the lateral and posterior walls of the left ventricle.

B. The left anterior descending artery supplies the sinoatrial node:
The LAD primarily supplies the anterior wall of the left ventricle and the interventricular septum, not the SA node.

C. The left coronary artery supplies the sinoatrial node:
The left coronary artery branches into the LAD and circumflex, which supply the left ventricle and parts of the atrium, but the SA node is usually supplied by the right coronary artery in about 60% of people.

D. The right coronary artery supplies the sinoatrial and atrioventricular nodes:
The RCA commonly supplies the SA node (~60% of people) and the AV node (~85% of people), which are crucial for initiating and coordinating the heartbeat. Occlusion of the RCA can cause arrhythmias or conduction blocks.

Correct Answer is A

Explanation

A. The right coronary artery supplies the inferior wall of the left ventricle:
The right coronary artery (RCA) typically supplies the inferior wall of the left ventricle, the right atrium, right ventricle, and part of the conduction system. Occlusion can lead to inferior myocardial infarction and conduction abnormalities, affecting ventricular function.

B. The circumflex artery supplies the anterior wall of the left ventricle:
The circumflex artery usually supplies the lateral and posterior walls of the left ventricle, not the anterior wall. The left anterior descending (LAD) artery supplies the anterior wall. Misidentification can affect understanding of myocardial infarction patterns.

C. The circumflex artery supplies the interventricular septum, crucial for left ventricular function:
The interventricular septum is primarily supplied by the LAD artery, not the circumflex artery. The septum is crucial for coordinated left ventricular contraction.

D. The left anterior descending artery exclusively supplies the right ventricle:
The LAD artery primarily supplies the anterior wall and interventricular septum of the left ventricle, not the right ventricle. Misunderstanding this can lead to errors in predicting areas affected during infarction.

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