In the human intestine, calcium is absorbed from food through both active and passive mechanisms.
Calcium moved against a concentration gradient. The calcium moves from lower to higher concentration. The energy is used in the form of ATP. A special type of carrier protein is used in this transport. This active transport is used in absorbing calcium, where calcium concentration in food is very low compared to body fluid. The passive transport of calcium does not require any energy, such as ATP. The calcium moves from higher to lower concentration. So transport of calcium depend on need of body and presence of calcium in food
Hence, calcium in concentration in food determine type of transport is used.
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