Q.

Which of the metallic ions is essential for blood clotting?

A. Na+
B. Ca++
C. K+
D. Fe++
Answer» B. Ca++
Explanation: Clotting also requires: calcium ions (Ca2+)(which is why blood banks use a chelating agent to bind the calcium in donated blood so the blood will not clot in the bag). about a dozen other protein clotting factors.
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