KAAP430 Chapter Notes - Chapter 1: Endoplasmic Reticulum, Cell Membrane, Myosin Head
21 Mar 2017
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Involuntary muscle: not under direct conscious control. Found attached to skeleton moves skeleton. Epimysium outer connective tissue covering the fiber. Holds muscle together & gives it shape. Fascicles bundles of fibers wrapped in connective tissue sheath. Length & angle estimate force-generating capacity of muscle. At end: fuses with tendon inserts into bone. Tendons: composed of fibrous cords of connective tissue: transmit force generated by muscle fibers to the bones create motion. Series of shallow folds along surface of fiber unless fiber is stretched. Maintains acid-base balance & transport of metabolites from capillary blood muscle fiber. Pass laterally through muscle fiber: exterior interior. Interconnected: pass among myofibrils transmit nerve impulses received by plasmalemma to individual myofibrils. Composed of sarcomeres basic contractile elements. Basic functional unit of a myofibril & basic contractile unit of a muscle. Composed of 2 protein strands twisted together. Many myosin heads cross-bridges that interact during muscle contraction. Passive force enhancement: increases force when stretched.
