Which heart chamber is responsible for pumping oxygen-rich blood to the body?
Left ventricle
Right ventricle
Left atrium
Right atrium
The Correct Answer is A
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
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.
Correct Answer is D
Explanation
A. Increase cardiac output by stretching the ventricles:
Stretching of the ventricles relates to preload, but papillary muscles and chordae tendineae do not directly stretch the ventricles to increase output.
B. Facilitate rapid conduction of electrical impulses:
Electrical conduction is carried by the SA node, AV node, bundle of His, and Purkinje fibers, not the papillary muscles or chordae tendineae.
C. Assist in opening the semilunar valves:
Semilunar valves (aortic and pulmonic) open due to ventricular pressure exceeding arterial pressure, not through papillary muscle function.
D. Prevent valve prolapse during ventricular contraction:
The papillary muscles contract during ventricular systole, pulling on the chordae tendineae, which anchor the mitral and tricuspid valves. This prevents backflow of blood into the atria (valve prolapse) and ensures efficient unidirectional flow.
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