There is 25 gr. magnesium in the adult. The rate increases with altitude.
Magnesium is found primarily combined with calcium and phosphorus in the complex salts of bone (70%).
The rest is distributed in plasma (1.4 to 2.5 mg / ml), primarily in red blood cells. About 80% is ionized and diffusible. The rest is bound to serum proteins.
* The muscles contain more magnesium than calcium, in contrast to the blood.
* In cells, its concentration is 15 mEq / l (milliequivalents per liter).
* The level of magnesium in the cerebrospinal fluid is higher than in serum.
* Only 45% of ingested magnesium is absorbed, 55% is excreted in the feces. It is absorbed in the small intestine and to some extent, into the stomach.
* The factors that inhibit the absorption of calcium also disrupt the magnesium: phosphate, calcium, alkalis, excess fat.
* Parathyroid hormone increases the absorption of magnesium from the intestine.
* Does not accumulate in the body.
* Excretion is by kidneys, liver, gall bladder-pancreas and gastrointestinal tract.
* The urinary excretion is relatively low because the kidney conserves magnesium efficiently. Aldosterone increases renal permeability for magnesium, as it does with the potassium to conserve sodium.
* Normally, between 60 and 120 mg. of magnesium per day are excreted in the urine.
Several factors regulate the normal excretion of magnesium
* Adrenal glands
* The parathyroid
* Pituitary
* Acid-base
With age, the body’s magnesium content tends to decrease, especially in the testicles and brain.
Tags: Magnesium is found primarily combined with calcium and phosphorus in the complex salts of bone (70%), muscles contain more magnesium than calcium, Parathyroid hormone increases the absorption of magnesium from the intestine, Several factors regulate the normal excretion of magnesium, There is 25 gr magnesium in the adult, urinary excretion is relatively low because the kidney conserves magnesium efficiently
