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The circulatory system = the heart + the blood vessels. The heart is a muscle, but the muscle fibers are slightly different to skeletal muscle. Arteries has a thin layer of muscle cells that surround them so that they can constrict or expand the blood vessels in order to regulate blood pressure.

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15y ago
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11y ago

The heart, which pumps the blood around, is a muscle itself.

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10y ago

The heart is an organ, not a muscle. However, it's the cardiac muscles that allow the heart to perform its function of pumping blood around the body.

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10y ago

the main parts are the heart, blood, blood vessels, and lungs

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12y ago

Heart and skin.

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Q: What organs have muscle tissue?
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