Physiology 2130 Study Guide - Globular Protein, Endoplasmic Reticulum, Muscle Fascicle
11 Jun 2013
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Document Summary
Number of muscle cells in a whole muscle depends on size of whole muscle. Lengths very from 1mm to 12 cm. Myofibril is made of a series of sarcomeres, the basic contractile unit of muscle. Contain glycogen as form of energy store and myoglobin in store o2. Whole muscle- fascicle- muscle cell/fiber- myofibril- myofilaments (thick and thin) Sarcoplasmic reticulum: forms a sleeve like structure around each myfibril, at the end of each fiber there is a lateral sac or terminal cisternae where calcium is stored. Transverse t- tubules: are continuations of the cell membrane that travel into muscle and wrap around myofibrils. They allow the ap to travel inside the muscle cell where contractile proteins are located. Thin myofilament: made of 3 proteins: actin- a globular protein forming a 2 strand chain, contains myosin binding sites, tropomyosin- rod shaped protein composed of 2 protein chains wrapped to form a super coil.
