Bone contains 99% of which mineral in the body?

Bone contains 99% of which mineral in the body?

• A. Magnesium
• B. Calcium
• C. Phosphorus
• D. Sodium

Answer: (B)

Calcium is stored predominantly in bone. About 99% of the body's calcium is locked into the skeleton as part of hydroxyapatite crystals, which give bone its hardness and structure. This bone calcium acts as a ready reservoir to maintain the right level of calcium in the blood, which is crucial for muscle contraction, nerve signaling, and blood clotting. Hormones like parathyroid hormone, vitamin D, and calcitonin regulate whether calcium is deposited into or released from bone to keep blood calcium within a narrow range. Phosphorus also resides in bone as part of the same crystal, but not to the same extent as calcium, while magnesium and other minerals are distributed differently.

Calcium is stored predominantly in bone. About 99% of the body's calcium is locked into the skeleton as part of hydroxyapatite crystals, which give bone its hardness and structure. This bone calcium acts as a ready reservoir to maintain the right level of calcium in the blood, which is crucial for muscle contraction, nerve signaling, and blood clotting. Hormones like parathyroid hormone, vitamin D, and calcitonin regulate whether calcium is deposited into or released from bone to keep blood calcium within a narrow range. Phosphorus also resides in bone as part of the same crystal, but not to the same extent as calcium, while magnesium and other minerals are distributed differently.