Cholecalciferol is produced by irradiation of 7-dehydrocholesterol with ultraviolet light either from the sun or from an artificial source.
胆
是7?脱氢胆固经日
或人工来源的紫外
而产生的。
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The parathyroid hormone gets the bones to release calcium, and gets the kidneys to reabsorb more calcium so it's not lost in the urine as well as synthesize calcitriol also known as 1,25-dihydroxycholecalciferol also known as active vitamin D.
甲状旁腺激素作用于骨骼使其释放离子，也作用于
增加的重
，
样就不会随尿液排出；以及用于合成骨化三醇，也称为1，25-二羟基胆化固醇，又叫活性维生素D。
