The nurse is planning an educational program for a group of senior citizens on the importance of calcium intake. The nurse will explain that approximately 50% of the calcium in the body participates in intracellular functions and is:
1. nonionized.
2. bound to albumin.
3. complexed.
4. ionized.
Correct Answer: 4
Rationale 1: Nonionized calcium is not the physiologically active form of calcium.
Rationale 2: Substances bound to albumin are not free to leave the bloodstream to carry out biological activities.
Rationale 3: Complexed calcium is not the physiologically active form of calcium.
Rationale 4: Ionized calcium is the only physiologically and clinically significant form of calcium.
Global Rationale: About 50% of the serum calcium is in an active, ionized form that participates in intracellular functions, including neuromuscular activity and blood coagulation. This is the only physiologically and clinically significant form of calcium. Substances bound to albumin are not free to leave the bloodstream to carry out biological activities. Complexed calcium is not the physiologically active form of calcium.
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