Calcium — functions?
Muscle contraction, neuronal activity, bone structure.
Bone calcium — main pool?
Stores about 99% of body calcium.
Calcium functions
Muscle, nervous, clotting, bone, cell communication.
Blood calcium forms
Protein-bound, anion-complexed, free Ca2+.
Major calcium store
Bone holds ~99% of body calcium.
Bone calcium pools
Readily exchangeable and stable pools.
Bone exchange dynamics
Rapid exchange in canaliculi; slow via remodeling.
Regulators of calcium
PTH, calcitriol, calcitonin.
Vitamin D activation
Liver to 25(OH)D, then kidneys to calcitriol.
Answer 11 questions on Calcium Homeostasis and Regulation.
1. Which body compartment contains about 99% of total calcium and serves as the main structural reservoir?
2. What is the approximate distribution of calcium in blood between protein-bound, anion-complexed, and free ionised forms?
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