BIO SCI E182 Lecture Notes - Alpha Motor Neuron, Actin, Muscle Spindle
2 Mar 2014
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Document Summary
Overall structure of a long tail with two globular heads that rotate and undergo a power stroke. Not all skeletal muscle fibers are exactly the same. Three major types of skeletal muscle fibers: slow-twitch oxidative, fast-twitch glycolytic, fast- twitch oxidative-glycolytic. Fast-twitch glycolytic muscle fibers: large diameter, pale color, easily fatigued (b/c run out of. Atp quicker); develop tension quicker; don"t have as much myoglobin as slow-twitch muscles; in sprinters; get atp from anaerobic glycolysis. Different fibers are mediated by different properties including myosin types. Sarcomeres are paralleled to longitudinal axis of the muscles sarcomeres . Sarcomeres are coming in and out of board. Fatigue in a muscle can have a lot of different causes! Fatigue is that the muscle can no longer sustain or generate contractions as well as it could before. Central fatigue: could be due to psychological effects (lack of motivation) and protective reflexes (undergoing extreme fear)
