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Muscle Physiology Essay #1


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A muscle contracts when the thin filaments slide over the thick filaments toward the center of each sarcomere. During contraction, the (1) move closer together and the (2) gets smaller. At rest, (3) molecules surround the thin filaments and prevent myosin crossbridges from binding with actin. When (4) is released from a (5) neuron and binds with (6) on the motor endplate, the muscle cell begins to (7). A primary event in the contraction of a muscle cell is the release of (8) from the sarcoplasmic reticulum. These ions moves by (9) into the cell and bind with the troponin and tropomysosin (the T and T system). The attachment of the Calcium causes the T and T system to re-configure (move a bit) and opens up myosin crossbridge binding sites. Crossbridges form with the actin and undergoes a power stroke. Each power stoke requires (10).

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