Cholecalciferol is produced by irradiation of 7-dehydrocholesterol with ultraviolet light either from the sun or from an artificial source.
胆钙化醇
7?
胆固醇经日
或人工来源
线照射而产生。
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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
释放
离子，也作用于肾脏而增加的重吸收，这样就不会随尿液排
；
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。
