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Phases of a muscle contraction

Phases of a muscle contraction - 2 are returned to the...

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Phases of a muscle contraction A muscle contraction in response to a single nerve action potential is called a twitch contraction. A myogram, a graph of muscle strength (tension) with time, shows several phases, shown in Figure 1: 1. The latent period is the time required for the release of Ca 2+ . 2. The contraction period represents the time during actual muscle contraction. 3. The relaxation period is the time during which Ca
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Unformatted text preview: 2+ are returned to the sarcoplasmic reticulum by active transport. 4. The refractory period is the time immediately following a stimulus. This is the time period when a muscle is contracting and therefore will not respond to a second stimulus. Since this is occurring at the same time as the contraction, it does not appear on the myogram as a separate event. Figure 1. The phases of a myogram....
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