During an contraction, the muscle develops tension without changing in length. An isometric contraction occurs at the of a muscle contraction and during prolonged activities. During an isotonic contraction, the muscle shortens even though the level of is maintained. During an isotonic contraction, a can be moved. The act of a muscle maintaining tension while it lengthens is called an isotonic contraction. During an isotonic eccentric contraction, a muscle is allowed to without going limp.

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photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.