BIOL 2410 Lecture Notes - Lecture 16: Myosin Head, Troponin C, Troponin T
15 Nov 2016
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Intercalated disk: connect the cells, have gap junctions, because they want all the muscle cells to contract at the same time. Usually attached to bones by tendons: muscle contracts, pulls tendon, pulls on bone, tendons are made from collagen. Origin: closest to the trunk of body or to more stationary bone. Flexor: brings bones together - decrease angle between 2 bones: contract biceps. Extensor: moves bones away: contract triceps. Antagonistic muscle group: flexor-extensor pairs: bicep and triceps, as one contracts the other relaxes. Satellite cells differentiate into muscle: begin as a stem cell, activated by injury or gh - turn into myoblasts, myoblasts form together to myotubes which mature into myofibres. Neurons with cell body in the motor cortex synapse on motor neurons in the sc. The group of muscle cells controlled by a motor neuron is a motor unit. In mammals each muscle cell receives only one synapse. Each muscle is composed of a large number of muscle cells.
