smooth muscle
smooth muscle
nounDefinition of SMOOTH MUSCLE
: muscle tissue that lacks cross striations, is made up of elongated spindle-shaped cells having a central nucleus, and is found especially in vertebrate hollow organs and structures (as the digestive tract and bladder) as thin sheets performing functions not subject to direct voluntary control and in all or most of the musculature of invertebrates other than arthropods — compare striated muscle
See First Known Use of SMOOTH MUSCLE
circa 1890
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