What is the primary role of the left ventricle in the circulatory system?
To pump blood to the lungs for oxygenation
To receive deoxygenated blood from the body
To regulate heart rhythm
To pump oxygenated blood into systemic circulation
The Correct Answer is D
A. To pump blood to the lungs for oxygenation:
The right ventricle pumps deoxygenated blood to the lungs. The left ventricle is responsible for systemic circulation.
B. To receive deoxygenated blood from the body:
The right atrium receives deoxygenated blood from the systemic veins.
C. To regulate heart rhythm:
Heart rhythm is controlled by the SA and AV nodes and the conduction system, not the ventricles themselves.
D. To pump oxygenated blood into systemic circulation:
The left ventricle has thick muscular walls that generate the high pressure needed to pump oxygen-rich blood through the aorta and systemic arteries to the entire body. Dysfunction leads to decreased perfusion and signs of left-sided heart failure.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Left ventricle:
The left ventricle is the main pumping chamber of the systemic circulation, sending oxygenated blood through the aorta to all tissues. Its thick muscular walls generate the high pressure necessary for systemic perfusion.
B. Right ventricle:
The right ventricle pumps deoxygenated blood to the lungs via the pulmonary artery, not to the systemic circulation.
C. Left atrium:
The left atrium receives oxygenated blood from the lungs and delivers it to the left ventricle; it does not generate enough force for systemic circulation.
D. Right atrium:
The right atrium receives systemic venous blood and delivers it to the right ventricle; it does not pump oxygen-rich blood to the body.
Correct Answer is A
Explanation
A. Pulmonic valve:
The pulmonic valve is auscultated at the second intercostal space, left sternal border. This is where blood exits the right ventricle into the pulmonary artery. Accurate valve auscultation helps identify murmurs, stenosis, or regurgitation in the right side of the heart.
B. Aortic valve:
The aortic valve is best heard at the second intercostal space, right sternal border, where blood exits the left ventricle into the aorta. Confusing these areas may lead to misidentifying murmurs.
C. Tricuspid valve:
The tricuspid valve is auscultated along the lower left sternal border, 4th-5th intercostal space, and controls blood flow from the right atrium to the right ventricle. Murmurs here indicate right-sided valvular problems.
D. Mitral valve:
The mitral valve is heard at the apex, 5th intercostal space at the midclavicular line. This valve regulates flow from the left atrium to the left ventricle. Misidentification can delay recognition of left-sided valvular pathology.
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