Stepping Up Tracing a Nerve Thesis

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An impulse opens "gates" in the membrane that allow the positive sodium ions to rush in, which pushes the impulses along by moving electrons. When the impulse passes, the sodium moves out again and the nerve cells basically resets itself back to its resting potential.

When the nerve impulses reach the muscles they are meant to move, a similar use of ions inside and outside the muscle fibers occurs. In this case, sodium and potassium are used to spread the impulse across the muscle, but it is the influx of calcium into muscle fibers that reacts with the tropomyosin present in the cells, causing the fibers to contract, which pulls on the bones of the skeletons creating movement.

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The specific leg muscles necessary for stepping up in a step are the biceps femoris, which flexes the knee and extends the hip, the pectneus, which flexes the hip and raises the leg, and the quadriceps which extends the leg......

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