Which of the following describes the endocardium?
Outermost layer that lies underneath the pericardial sac
Outer layer that produces serous fluid
inner layer that is continuous with the blood vessels
Central layer that contracts and relaxes.
The Correct Answer is C
a. Outermost layer that lies underneath the pericardial sac: This describes the epicardium, not the endocardium.
b. Outer layer that produces serous fluid: This describes the pericardium, particularly the visceral layer.
c. Inner layer that is continuous with the blood vessels: The endocardium is the innermost layer of the heart, lining the heart chambers and continuous with the endothelium of blood vessels.
d. Central layer that contracts and relaxes: This describes the myocardium, the muscular middle layer of the heart
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
a. Vas deferens: This is a tube that transports sperm from the epididymis to the ejaculatory ducts but does not form the bulk of the testis.
b. Seminiferous tubules: These tubules are where sperm production (spermatogenesis) occurs and constitute the majority of the testicular mass.
c. Seminal vesicles: These are glands that produce seminal fluid and are not part of the testis.
d. Corpus cavernosum: This is erectile tissue found in the penis, not in the testis.
Correct Answer is A
Explanation
a. Smooth: Correct. Smooth muscle cells in the walls of blood vessels regulate their diameter through contraction and relaxation.
b. Striated: Striated muscles, also known as skeletal muscles, are involved in voluntary movements and are not responsible for regulating blood vessel diameter.
c. Cardiac: Cardiac muscle is found in the heart and is responsible for pumping blood, not regulating blood vessel diameter.
d. Skeletal: Skeletal muscles control voluntary movements and are not involved in regulating blood vessel diameter.
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