BIOC32H3 Lecture Notes - Lecture 24: Smooth Muscle Tissue, Ciliary Body, Depolarization

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9 Jan 2015
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Move material into, out of, and around the body. Primary muscle of internal organs and tubes (except the heart) e. g trachea, esophagus, intestines etc. Involuntary; control arises from autonomic nervous system (ans) *note: some can spontaneously contract and are influenced by hormones. Six groups of smooth muscle in humans: vascular e. g blood bessels, respiratory e. g airway passages, gastrointestinal e. g walls of digestive tract, reproductive e. g uterus, penis, urinary e. g walls of bladder, ocular e. g iris of eye. Single unit smooth muscle e. g forms walls of internal organs, small intestine, and blood vessels. Smooth muscle cells = electrically connected to each other via gap junctions -> allows for the muscle to contract as a single unit b/c depolarisation spreads through the muscle easily through junctions. No reserve units left to increase the force of contraction. Multi-unit smooth muscle e. g iris and ciliary body of eye, parts of male reproductive tract and uterus.

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