Which muscle is involuntary and found in the walls of blood vessels?

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Study the AQA A Level PE Test for The Cardiovascular System. Prepare with flashcards and multiple choice questions, each with explanations. Get ready for exam success!

Multiple Choice

Which muscle is involuntary and found in the walls of blood vessels?

Explanation:
Smooth muscle is the type that works automatically and is found in the walls of blood vessels. It’s controlled by the autonomic nervous system, so you can’t consciously move it. Its main role is to adjust the diameter of vessels, causing vasoconstriction or vasodilation to regulate blood flow and blood pressure. Unlike skeletal muscle, smooth muscle fibers are non‑striated and spindle-shaped, arranged in layered walls of vessels. Cardiac muscle is also involuntary but located in the heart, not in the vessel walls, while skeletal muscle is voluntary and attached to bones.

Smooth muscle is the type that works automatically and is found in the walls of blood vessels. It’s controlled by the autonomic nervous system, so you can’t consciously move it. Its main role is to adjust the diameter of vessels, causing vasoconstriction or vasodilation to regulate blood flow and blood pressure. Unlike skeletal muscle, smooth muscle fibers are non‑striated and spindle-shaped, arranged in layered walls of vessels. Cardiac muscle is also involuntary but located in the heart, not in the vessel walls, while skeletal muscle is voluntary and attached to bones.

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