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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 A

Explanation

a. Pancreas: The pancreas has both endocrine functions (releasing insulin and glucagon into the blood) and exocrine functions (secreting digestive enzymes into the small intestine).

b. Pituitary: This is an endocrine gland only, releasing hormones into the bloodstream.

c. Thyroid: This is also an endocrine gland, producing hormones like thyroxine and triiodothyronine.

d. Hypothalamus: The hypothalamus primarily functions as part of the endocrine system, regulating the pituitary gland and releasing hormones into the blood.

Correct Answer is D

Explanation

a. Elastic connective tissue: This tissue contains elastic fibers and fibroblasts, providing elasticity and flexibility but not the tightly packed, parallel collagen fiber arrangement.

b. Dense irregular connective tissue: This tissue has collagen fibers arranged in a random, irregular pattern, providing strength in multiple directions but not the parallel arrangement.

c. Reticular connective tissue: This tissue contains reticular fibers forming a network to support soft organs but does not have densely packed collagen fibers.

d. Dense regular connective tissue: This tissue has fibroblasts packed tightly between parallel arrays of collagen fibers, providing great tensile strength along the direction of the fibers. It is found in tendons and ligaments.

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