KPE160H1 Chapter Notes - Chapter 1: Motor Unit, Ford Power Stroke Engine, Myofibril
31 Jan 2017
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Path of a muscle twitch/contraction at the bicep muscle: it starts in your mind! Let"s sa(cid:455) for e(cid:454)a(cid:373)ple, you want to flex your arms. This creates nerve impulses: a special chemical gets released when the electrical signal of the neuron reaches the end of the (cid:862)a(cid:454)o(cid:374)(cid:863) (cid:894)(cid:271)ul(cid:271) part(cid:895). This results in something called a cross-bridge binding: as a result of the cross- bridge binding, the myosin. Power stroke process: this causes 2 things to occur: movement in the z- H-band: due to the power stroke process, many contractions occur. First, it is the sarcomeres that contract: many sarcomeres make up a myofibril. Therefore, when: many myofibrils make up a muscle fibre. Therefore, when the sarcomeres contract the myofibrils contract simultaneously, the myofibrils simultaneously, the muscle contract. fibres contract: many muscle fibres make up a motor unit. Therefore, when the muscle fibres contract simultaneously, the motor units contract: many motor units make up a muscle.
