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Audrey Flores Period 3 Muscular System - Coggle Diagram

- - - - It is genaration and propagation of an action potential. If the endplate potential causes enough change in the membrane voltage to reach critical levels called threshold the voltage gates sodium channels in the membrane will open. This is a large influx (inward movement) of sodium through the channels into the cell that triggers action potential that is unstoppable and would lead to muscle contraction.
    - - It is the restoration if resting conditions. The sodium voltage gated channels close and voltage gated potassium channels open. The potassium efflux (pump out/flow out) out of the cell quickly which brings the cell back to it's initial resting membrane voltage
    - - Ach (Acetylcholine) is released from motor neuron. This binds Ach receptors on the sarcolemma this cause the chemically gated ion channels on the sarcolemma to open. This causes sodium to diffuse in the muscle fiber and some potassium diffuses out, but not much. The interior of the sarcolemma becomes less negative/more positive
- - - - In this sarcomere there is two proteins called actin (thin protein) and myosin (thick protein). These proteins cause the release of acetlycholine. Acetylcholine causes depolarization which makes calcium release from the sarcoplasmic reticulum. The calcium binds the troponin which changes it's shape and moves the tropomyosin. This releases ATP which lets the myosin be pulled inward which contracts the muscle.
      - When an ATP molecule binds to a myosin head the myosin detaches from the actin and the cross bridge breaks. This happens over and over again and is known as the ratchet mechanism.