Which layer of the heart contains the cardiac muscle responsible for contraction?
Epicardium
Pericardium
Myocardium
Endocardium
The Correct Answer is C
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
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.
Correct Answer is D
Explanation
A. Fifth intercostal space, midclavicular line:
This is the location for auscultating the mitral valve, not the aortic valve.
B. Second intercostal space, left sternal border:
This is the typical location for the pulmonic valve, at the left upper sternal border.
C. Fourth intercostal space, left sternal border:
This area corresponds to the tricuspid valve, along the lower left sternal border.
D. Second intercostal space, right sternal border:
The aortic valve is best heard at the second intercostal space, right sternal border, which is the upper right portion of the heart base. This is important for detecting aortic stenosis or other semilunar valve abnormalities.
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