KINE 1020 Lecture Notes - Lecture 33: Myocyte, Relaxed Muscle, Troponin
5 Dec 2016
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The rst is by attaching to it, without energy release. The second way is when it release energy to get myosin back into a position where it can"t bind with actin: once atp is energized in that cocked stretched position. Different types of muscle bres have different types of myosin. This is based on twitch contractile speed, and you are born with a speci c number of these, so you"re basically either born better at sprinting or long distance running. Type 1- slow twitch: they have slow contracting, they don"t fatigue as easily, posture muscles have a lot of type 1 myosin. Type 2a- fast twitch: fatigue resistant: contract faster, have some resistance to fatigue, are used mostly for basic movements, like walking that aren"t very exertive, or tiring. Type 2x - fast twitch, but easily fatigued: contract the fastest, get tired the fastest, muscle bres used for hard movements and explosive movements, like jumps and sprints.
