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Which type of muscle tissue is responsible for voluntary movements?

A.

Cardiac muscle

B.

Smooth muscle

C.

Skeletal muscle

D.

Striated smooth muscle

Answer and Explanation

The Correct Answer is C

A. Cardiac muscle: Cardiac muscle is involuntary and found only in the heart. It contracts automatically to pump blood and cannot be consciously controlled, so it does not contribute to voluntary movements.

B. Smooth muscle: Smooth muscle is also involuntary and is found in the walls of internal organs such as the intestines, blood vessels, and bladder. Its contractions are automatic and not under conscious control.

C. Skeletal muscle: Skeletal muscle is under voluntary control and is attached to bones via tendons. Contraction of skeletal muscles allows deliberate movements such as walking, lifting, and writing, making it responsible for voluntary actions.

D. Striated smooth muscle: Striated smooth muscle is not a recognized type of muscle tissue. Striated muscles refer to skeletal and cardiac muscle, whereas smooth muscle is non-striated and involuntary.


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Related Questions

Correct Answer is B

Explanation

A. Lymph vessels: Lymph vessels transport interstitial fluid and do not play a direct role in regulating blood pressure or circulatory resistance during shock.

B. Arterioles: Arterioles are small resistance vessels that regulate blood flow and systemic vascular resistance through constriction or dilation, making them critical in maintaining perfusion during shock.

C. Capillaries: Capillaries are the site of nutrient and gas exchange, but they do not actively control vessel tone or systemic blood pressure.

D. Large veins: Large veins serve as capacitance vessels and blood reservoirs; their tone affects venous return, but arteriolar constriction is more directly responsible for perfusion changes in shock.

Correct Answer is B

Explanation

A. Transport blood from the lungs to the heart: This is the role of the pulmonary veins, which carry oxygenated blood from the lungs to the left atrium, not the coronary arteries.

B. Supply oxygenated blood to the myocardium: Coronary arteries branch from the aorta and deliver oxygen-rich blood directly to the heart muscle, ensuring the myocardium receives the nutrients and oxygen required for continuous contraction.

C. Pump blood into the systemic circulation: Pumping blood into the systemic circulation is the function of the left ventricle, not the coronary arteries.

D. Remove carbon dioxide from the cardiac tissue: While venous drainage removes metabolic waste, this is primarily the role of coronary veins, not the coronary arteries.

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