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Just Had to Do This to Sign Up

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Submitted By b3lleheaven
Words 785
Pages 4
STUDY QUESTIONS

1. The smallest voltage required to produce a contraction was .85. The proportion of fibres in the muscle that were contracting was only 10-20% of total fibres available. The nervous systems controls the amount of muscle fibres that contract. In this case only a small depolarization is causes and this was evident in the graph produced
4) The all or none law states that strength of muscle force will be the same at any stimuli strength if the stimuli strength is above the threshold of the muscle in question. The muscle will either respond fully or not respond at all, hence the name all or none. Once the minimum force threshold is met the muscle will respond, however below the minimum threshold no response will be visible. The muscle contraction is all based on the ability of channels to open. The more the channels open the stronger the depolarization event occurs. Responses to stimuli were graded on the strength of the contractions and the ability to create force. These forces were able to be compared to other forces throughout the experiments.

EFFECTS OF STRETCH ON CONTRATION FORCE

1. The effect of stretching the muscle increases the contraction strength to a certain point until the muscle is over stretched. This was where our results stopped. This is known as the optimal length. However if we kept stretching the muscle over time it would of plateaued before decreasing. The muscle stretches to achieve an optimal length. If a muscle has not reached its optimal length less tension can be developed for 3 reasons: The thin filaments of one side of the sarcomere become overlapped with the other which does not allow actin to bind to a large portion of the filaments limiting the action potential. The thick filaments become forced against a Z section and further shortening is caused. The shorter the muscle becomes less and less actin is able

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