PHGY 209 Lecture Notes - Lecture 1: Scleroprotein, Bronchus, Sliding Filament Theory
12 Jan 2018
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Document Summary
3 muscle tissue types: skeletal muscle is used for posture and locomotion. This is the muscle that enables our arms and legs to contract, under our conscious control (voluntary control). Focus more: cardiac muscle is responsible for the rhythmic contractions of the heart (involuntary, smooth muscle causes involuntary contraction in blood vessels, gut/intestines, bronchi and the uterus. Contraction: in the picture: bicep is attached to a tendon, when the bicep contractions pulls that tendon that pulls the ulnar/radial bone to come upwards. Skeletal muscle is composed of bundles of long (up to 1 ft) thin cells called muscle fibers. Fascicles: bundles of muscle fibers: fascicles are bundled together to form the entire muscle. Skeletal muscle attach to and move bones characterized by: striations, multinucleated long cylinders called fibers not true cells (as long as the muscle organ but as wide as a cell, voluntary or conscious control and involuntary (reflexes)
