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Which of the following types of muscles regulate the diameter of blood vessels?

A.

Smooth

B.

Striated

C.

Cardiac

D.

Skeletal

Answer and Explanation

The Correct Answer is A

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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Related Questions

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.

Correct Answer is C

Explanation

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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