Most calcium is metabolized.

Most calcium is metabolized.

• A. True
• B. False
• C. Not sure
• D. Unknown

Answer: (B)

Calcium in the body is not primarily metabolized or broken down like other nutrients. About 99% of total body calcium is stored in bone as part of the mineral matrix, acting as a reservoir. The remaining calcium circulates in blood and inside cells and is involved in signaling, muscle contraction, and other functions, with a small daily turnover. What truly happens is a balance among gut absorption, renal excretion, and bone remodeling—bone can release or take up calcium as needed, under hormonal control (PTH, calcitriol, calcitonin). Since most calcium is tied up in bone rather than being chemically metabolized, the statement is false.

Calcium in the body is not primarily metabolized or broken down like other nutrients. About 99% of total body calcium is stored in bone as part of the mineral matrix, acting as a reservoir. The remaining calcium circulates in blood and inside cells and is involved in signaling, muscle contraction, and other functions, with a small daily turnover. What truly happens is a balance among gut absorption, renal excretion, and bone remodeling—bone can release or take up calcium as needed, under hormonal control (PTH, calcitriol, calcitonin). Since most calcium is tied up in bone rather than being chemically metabolized, the statement is false.