NSCI 1413 Lecture Notes - Lecture 11: Tetanus, Acetylcholine, Endoplasmic Reticulum
6 May 2017
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Document Summary
Smooth muscle: involuntary; no striations due to the arrangement of actin and myosin filaments; controlled by the autonomic nervous system. Walls of blood vessels and the digestive tract (peristalsis: cardiac muscle: involuntary; striated; generates its own action potential. Skeletal muscle: voluntary; very large and multinucleate; work in antagonistic pairs. Each muscle contains bundles of long, cylindrical, and multinucleate muscle cells. Various modified structures that allow muscles to contract: each muscle cell; can propagate an action potential. Sarcolemma: the modified plasma membrane of a muscle cell that surrounds. Sarcoplasmic reticulum: modified er that contains sacks of ca 2+ necessary for. T system: a system of tubules that runs perpendicular to the sr and connects. Sarcomere: the functional unit of the muscle cell; boundaries marked by z-lines ; the sr to the extracellular fluid normal muscle contraction gives skeletal muscle its striated appearance.
