ME 212 Lecture Notes - Lecture 8: Myofilament, Organelle, Endomysium

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*skeletal muscles (>600) are highly organized for muscle contraction or movement in living animals* Organization of muscle: muscle, muscle bundle, muscle fiber (myofiber, myofibril, myofilament. Invaginations that allow depolarization of the membrane: motor neurons. Control center of the cell: blood vessels. A short lasting event in which the electrical membrane potential of a cell rapidly rise and falls. An electrical current travels down an axon of a neuron: acetylcholine. A chemical compound that acts as a neurotransmitter and delivers the message for contraction: actomyosin. The chemical protein formed by the cross-bridge of actin and myosin: resting membrane potential, depolarization. A change in a cell"s membrane potential, making it more positive: repolarization (hypopolarization) Muscle fibers: red vs. white vs. intermediate. Fiber type: amount of myoglobin present causes differences in color. Slower contraction for a longer amount of time. Marathon runner: white muscle = phasic (supportive) Important for high mobility muscles for rapid movement.

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