The speed at which a muscle contracts is inversely related to the resistance or

Question

The speed at which a muscle contracts is inversely related to the resistance or load. When a muscle begins to contract, tension increases gradually. To move an object, muscle tension must exceed the load, and it will take longer for tension to exceed the load of a heavier object than a lighter object. Thus, you can lift the load of heavier object more quickly than a heavy object. Obtain three or four dumbbells (or other objects that are easy to hold) of various weights. Rest the forearm of your dominant side flat on the laboratory bench with your palm directed superiorly. From this position, grasp the lightest dumbbell (or other object) and lift it with moderate force by flexing your forearm. Do not use maximum force, and keep your elbow on the bench surface as you lift. Repeat steps 2 and 3 with the other dumbbells, in ascending weight order. Be sure you apply the same level of force with each lift as you used in the previous step, and keep your arm and forearm in the same positions. Describe your results in terms of speed of contraction versus increasing load(resistance).

Explanation / Answer

we know that the muscle contracts when the tension or weight or force of the object increases. when we are liftiong a lightest dumbell as the force or weight of the dumbell is less when we lift with moderate force the speed of contraction is more and the resistance of increasing load is less and when we increase thw weight of the dumbells and repeat the activity, at the dumbell of more weight the spped of contraction will be less and the resistence of increasing load is more as the weighter objects cannot be moved easily as the muscle tension will be gradually decreasing when the load increases.

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