Multiple choice

The level of calcium in the blood is regulated because

  1. extra calcium calcifies the bones, which thus become brittle and are likely to get cracks

  2. extra calcium gets deposited in the blood vessels and thus, clogs them

  3. it is crucial for blood clotting

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 Calcium is necesary for clotting of blood. 

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