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Which of the following describes the endocardium?

A.

Outermost layer that lies underneath the pericardial sac

B.

Outer layer that produces serous fluid

C.

inner layer that is continuous with the blood vessels

D.

Central layer that contracts and relaxes.

Answer and Explanation

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


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Related Questions

Correct Answer is A

Explanation

a. Pyloric sphincter: This sphincter regulates the passage of chyme from the stomach into the duodenum.

b. Lower esophageal sphincter: This sphincter prevents the backflow of stomach contents into the esophagus.

c. Ileocecal sphincter: This controls the flow of material from the ileum of the small intestine into the cecum of the large intestine.

d. Internal anal sphincter: This sphincter controls the release of feces from the rectum but is not involved in the release of chyme

Correct Answer is D

Explanation

a. Decrease in sodium reabsorption: This would lead to further lowering of blood pressure, which is not a compensatory response.

b. Dilation of the afferent arteriole: This typically increases glomerular filtration rate but is not a primary response to decreased blood pressure.

c. Constriction of the efferent arteriole: This response helps to increase glomerular pressure but is secondary to other mechanisms.

d. Release of renin: Renin is released by the kidneys in response to low blood pressure, initiating the renin-angiotensin-aldosterone system (RAAS) to increase blood pressure by conserving sodium and water and constricting blood vessels.

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