Hydrogen sulfide is the third largest gas signal molecules involved in vascular tone myocardial contraction nerve transmission and regulation of insulin secretion .

硫化氢是第三大气体信号分子，参与血管 张力，心肌 收缩，神经传递和胰岛素的分泌调节。

The color can affect person 's visual effect the warm tone is the expansion color and cold tone is the contraction color .

色彩会影响人的视觉效果，暖色调为扩张色，冷 色调为 收缩色。

Due to its unique position in the vessel wall ECs may respond to changes in local conditions such as blood pressure oxygen tension and blood flow by secreting substances which have powerful effects on the tone of vascular smooth muscle causing either contraction or relaxation .

由于其在血管壁中的特殊位置，故内皮细胞可以对局部血管的血压、氧分压及血流变化迅速作出反应，通过合成和分泌多种血管活性物质作用于血管平滑肌，从而 调节血管的舒张和 收缩。