BIOC32H3 Lecture Notes - Lecture 22: Myosin Head, Brainstem, Glycogen

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9 Jan 2015
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Three types of muscle cells: skeletal, cardiac, and smooth muscle. Attached to bones of the skeleton by collagenous tendons. Voluntary; contracts in response to a signal from a somatic motor neuron. *note: skeletal muscles cannot initiate their own contraction (no spontaneous contraction) and are not influenced by hormones. Involuntary; primary extrinsic control arises from autonomic nervous system (ans) *note: cardiac muscles can spontaneously contract (doesn"t need nervous input) and are influenced by hormones. 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. *note: some can spontaneously contract and are influenced by hormones. Origin: the end of muscle that is attached proximally to the trunk or stationary bone (less movable bone) Origin tends to be the bone that is more dense. Insertion: the end of the muscle attached to the more distal or mobile bone. Most joints have pairs of muscles; one flexor and one extensor.

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