A normal blood cell is round and almost donut-like in shape. Sickle cells are hard, rigid, and shaped in a curve.
The statement that isotonic exercise occurs when force is exerted against an object that does move is false.
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In contrast, isotonic exercise occurs when force is exerted to move an object. In this type of exercise the contracting muscle shortens against a constant load. Lifting weights, squats, stair climbing, biceps curls are all examples of isotonic exercises.
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The answer (C.)Group team sports is a sports consisting of more than one player on the field or court at a time. Hope it helped you, and have a great day.