BIOL 2500 Lecture Notes - Lecture 10: Skeletal Muscle, Epimysium, Endomysium
5 Oct 2016
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Excitability: responsiveness/ can receive and respond to stimuli! Skeletal and cardiac: which types of muscle tissue are involuntary, which types of muscle tissue are striated, which one is not striated, which one is voluntary, skeletal muscles are-! Carries blood vessels and nerves to individual muscle bers ! Direct attachments are when the epimysium is fused to periosteum or periochondrium! Large cells (up to 30 cm long or 10-100 um in diameter) ! Functional unit of skeletal muscle, z disc to z disc, aligned end to end in myo bril ! Actin, made up of g- actin (polypeptide subunits) strung together, 2 twisting strands ! Rod shaped protein that runs along actin ! Binding sites on actin when muscles relax! Biceps branchii vs. forearm exion, triceps branchii vs. forearm extension ! Wrists extensors prevent wrist from bending when nger exors contract ! On opposite dies of joint as prime mover !
