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8 Cards in this Set
- Front
- Back
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Sarcomere
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--Smallest functional contractile unit of a muscle fiber
--Region of myofibril between the two z discs. --Composed of thick and thin myofilaments made of contractile proteins. |
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T Tubules
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--Continuous with the sarcolemma
--Penetrates the cell's interior at each A band-I band junction --Associate with the paired terminal cisternae to form triads that encircle each sarcomere |
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Somatic motor
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body moving neuron
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Voltage-gated
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opens in response to electricity
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Ligand-gated
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opens in response to protein/chemical binding
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Repolarization in Action Potential
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returns to its resting state
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Cross-bridge formation
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1. Calcium binds troponin
2. This causes the tropomyosin "rope" to get off the binding sites for myosin 3. Now myosin can form a cross bridge with actin |
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Role of calcium in contraction
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--Calcium binds to troponin, allowing troponin to change its shape and move the tropomyosin away from the active sites
--When over, calcium is pumped back into the SR and contraction ends |
