噻嗪类药激活由钙激活的血管平滑肌钾通道，抑制血管组织中的各种碳酸酐酶。
Thiazides cause vasodilation by activating calcium-activated potassium channels in vascular smooth muscles and inhibiting various carbonic anhydrases in vascular tissue.
那么，当流动的血液中钙含量过低，一个叫做甲状旁腺的发信号装置就会激活一个流程，致使骨骼中的钙流失到血液里。
Then, when the blood runs low on calcium, a signaling device called the parathyroid gland can activate a process by which calcium is taken from the skeleton and put back into the blood.
钙也是必不可少的细胞结构，肌肉收缩，神经传递，酶激活和激素功能。
Calcium is also essential from cellular structure, muscle contraction, nerve transmission, enzyme activation and hormone function.
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