BIOC32H3 Lecture Notes - Lecture 22: Skeletal Muscle, Cardiac Muscle, Smooth Muscle Tissue

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7 Jan 2018
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Cardiac muscle: cardiac muscle only found in hearts. Skeletal muscle attachment: always attached to bone through tendons, attached to two places, origin place closes to trunk (more proximal) more stationary. Insertion further away from trunk (more distal) more mobile: stationary bone has greater mass, mobile bone is the one that moves end of muscle attached closest to the trunk or stationary bone. I(cid:373)porta(cid:374)(cid:272)e (cid:271)e(cid:272)ause you do(cid:374)(cid:859)t (cid:449)a(cid:374)t (cid:271)oth to (cid:271)e a(cid:272)ti(cid:448)e at sa(cid:373)e ti(cid:373)e or there (cid:449)ill (cid:271)e (cid:374)o movement: e. g. dystonia movement disorder causes arm to be bend out of place (refer to next lecture) Muscle fascicle bundles of muscle fibers + connective tissue muscle fibers next slide. Muscle fiber anatomy: components of muscle fibers. Components of myofibrils: sarcomere made up of thin and thick filaments (actin / myosin, without the t-tubules depolarization would occur by diffusion of a positive current, a slow process that would not allow simultaneous contraction of all myofibrils.

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