Smooth muscle Notes: Definitions & Explanations PDF | Download eBooks
Study Smooth muscle lecture notes PDF with biology definitions and explanation to study What is Smooth muscle?. Study smooth muscle explanation with biology terms to review biology course for online degree programs.
Smooth muscle Definition:
Smooth muscle, which lacks striations, is found in the walls of the digestive tract, urinary bladder, arteries, and other internal organs. cells are spindle shaped. Smooth muscles are responsible for involuntary body activities, such as churning of the stomach and constriction of arteries.
Campbell Biology by J.B. Reece, L.A. Urry, M.L. Cain, S.A. Wasserman, P.V. Minorsky, R.B. Jackson
Smooth muscle Notes:
Smooth muscle is an involuntary non-striated muscle. It is divided into two subgroups; the single-unit (unitary) and multiunit smooth muscle. Within single-unit cells, the whole bundle or sheet contracts as a syncytium. Smooth muscle cells are found in the walls of hollow organs, including the stomach, intestines, urinary bladder and uterus, and in the walls of passageways, such as the arteries and veins of the circulatory system, and the tracts of the respiratory, urinary, and reproductive systems. These cells are also present in the eyes and are able to change the size of the iris and alter the shape of the lens.
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