Calcium metabolism

Calcium Metabolism is the process by which the body maintains adequate levels of calcium. Calcium is a vital mineral that is required for several important physiological functions, including bone health, nerve transmission, muscle contraction, and blood clotting.

Overview

Calcium metabolism refers to the movements and regulation of calcium ions (Ca2+) in and out of various body compartments, such as the gastrointestinal tract, blood plasma, extracellular fluid, and intracellular fluid.

Regulation

The regulation of calcium metabolism is complex and involves several organs, including the kidneys, bones, and intestines, as well as hormones such as parathyroid hormone (PTH), calcitonin, and vitamin D.

Parathyroid Hormone

Parathyroid hormone (PTH) is secreted by the parathyroid glands in response to low blood calcium levels. PTH acts to increase blood calcium levels by stimulating the release of calcium from the bones, increasing the absorption of calcium in the intestines, and reducing the excretion of calcium in the urine.

Calcitonin

Calcitonin is a hormone produced by the thyroid gland that acts to decrease blood calcium levels. It does this by inhibiting the activity of osteoclasts, cells that break down bone to release calcium into the bloodstream.

Vitamin D

Vitamin D is a fat-soluble vitamin that is essential for the absorption of calcium in the intestines. It is synthesized in the skin in response to sunlight and can also be obtained from the diet.

Disorders of Calcium Metabolism

Disorders of calcium metabolism can lead to either hypercalcemia (high blood calcium levels) or hypocalcemia (low blood calcium levels). These conditions can have serious health consequences, including osteoporosis, kidney stones, cardiovascular disease, and neurological disorders.

See Also

• Bone metabolism
• Mineral (nutrient)
• Electrolyte imbalance

Calcium metabolism Resources
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