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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. Carrying stimulus to the spinal cord and the brain from all other parts of the body: This is the function of afferent neurons, not efferent neurons.

b. Conducting impulses from sensory neurons to motor neurons: This describes interneurons, which relay signals between sensory and motor neurons.

c. Regulating neuron function: This is a vague description and doesn't specifically relate to the primary role of efferent neurons.

d. Carrying stimulus away from the brain and spinal cord: This correctly describes efferent neurons, which carry motor commands from the central nervous system to muscles and glands.

Correct Answer is C

Explanation

a: Chest cavity compresses the lungs - This is incorrect; during inspiration, the chest cavity expands, not compresses.

b: Length of the thoracic cavity decreases - This is incorrect; during inspiration, the thoracic cavity increases in length as it expands.

c. Diameter of the thoracic cavity increases. When inspiratory muscles contract, such as the diaphragm and external intercostal muscles, the thoracic cavity expands, increasing its volume. This expansion decreases the pressure within the lungs, causing air to flow in (inspiration).

d: Diaphragm rises up in the abdomen - This is incorrect; during inspiration, the diaphragm contracts and moves downward, not upward.

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