Multiple choice

Calcium is carried into the bloodstream by ________

  1. Active transport

  2. Diffusion
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A Correct answer
Explanation

Calcium absorption in the small intestine occurs primarily via active transport, especially when dietary calcium levels are low or moderate. This process is highly regulated by active vitamin D (calcitriol). While passive diffusion also occurs when calcium levels are very high, active transport is the primary physiological mechanism for carrying calcium into the bloodstream under normal conditions.

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