Multiple choice

Which of the following is used during blood clotting?

  1. CO

  2. Ca2+

  3. Na+

  4. Cl-

  5. -
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Clotting requires calcium ions. Blood banks use a chelating agent to bind the calcium in donated blood, so the blood will not clot in the bag.

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