BIOL273 Chapter Notes - Chapter 3: Endoplasmic Reticulum, Myocyte, T-Tubule
29 Nov 2017
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Biol273 midterm #2 muscle tissue specialized to convert biochemical reactions into mechanical work. Muscle function: generate motion, generate force can only contract cannot expand -> unless it is pulled by antagonist muscle groups the signals do not allow for expansion generate heat & body temperature homeostasis, use atp and hydrolyze atp. Myofibrils: there are so many myofibrils there is no room for other. Muscle cell: muscle fibre cell membrane: sarcolemma cytoplasm: sarcoplasm. Structure of myofibril contractile structures of muscle fibre -> occupy most of the space in a muscle fibre. Contractile proteins: actin, myosin regulatory proteins: tropomyosin, troponin (regulate the contractile proteins) accessory proteins: titin, nebulin, a actinin, others. *** these are all proteins in myofibril, subdivided into 3 categroies, (cra-> contractile, One repeated pattern of this unit forms a sarcomere which is made up of: z-line (disks) (zwischen -> german between) Organization of the myofibril protein components (myosin and actin)
