Lab #4 - respond. 7. The force of the muscle contraction...

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Sylwester Czado 10-18-07 BIO 244, Lab #4 TA: Shannon Gerry Muscle Worksheet 1. Three types of muscle are skeletal, smooth, and cardiac. Skeletal muscle is connected to bones and tendons. Smooth muscle is found in the digestive tract. Cardiac muscle is found in the heart. 2. The functional unit of a skeletal muscle fiber is a sarcomere. 3. See attached graph paper 4. The two ways that the nervous system can control the force generated by a muscle are recruitment and summation. 5. See attached graph paper 6. A stimulus of 0 mV did not elicit a muscle contraction. There should not be any response by the muscle because it has not reached threshold. To get an Action Potential, the muscle needs to reach the threshold voltage to activate an electrical impulse. Then the muscle can contract. 0 mV is not enough to cause the muscle to
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Unformatted text preview: respond. 7. The force of the muscle contraction does increase because many motor neurons are responding to the increased stimulus voltage. This allows more muscle cells to contract. 8. The role of tropomyosin in muscle contraction is that it fits into grooves of actin filament. This enables the myosin site to be exposed. 9. Calcium is required for muscle contraction because it needs to be pumped into the cell, so that it can bind to troponin. This causes a change in troponin which changes into tropomyosin. Then actin and myosin interact with each other and the sarcomere contracts. 10. ATP is required for muscle contraction because it is our energy source. ATP is released so that actin and myosin can link up. This allows the filaments to slide over one another causing a contraction....
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This note was uploaded on 04/30/2008 for the course BIO 244 taught by Professor Van sciver during the Fall '06 term at Rhode Island.

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Lab #4 - respond. 7. The force of the muscle contraction...

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