It is a source of a messenger molecule called cAMP, and its activity is regulated by bicarbonate ions.

它是一种名为cAMP的信使分子的来源，其活动受到碳酸氢根离子的调节。

Saliva contains bicarbonate ions, which helps to neutralize acid in the mouth, and glycoproteins like mucin which thickens the saliva.

它包含着碳酸氢根离子，可以中和口腔中的酸，还有糖蛋白，可以使唾液变得粘稠。

Mucus is mostly made up of water and glycoproteins, and also bicarbonate ions which are also secreted by foveolar cells.

粘液主要由水和糖蛋白组成，还有胃小凹细胞分泌的碳酸氢根离子。

Meanwhile, ion exchangers on the basal surface of the cell move the negatively charged bicarbonate ion into the extracellular space, causing an increase in pH.

同时，细胞基底面的离子交换将带负电荷的碳酸氢根离子移入细胞外，导致pH值升高。

The bicarbonate ions each have one hydrogen.

碳酸氢根离子各有一个氢。

And this reactions right over here, you have the bicarbonate ion that looks something like this.

这个反应就在这里，你有看起来像这样的碳酸氢根离子。

First, the solid calcium carbonate reacts with the protons from acidic rain to form calcium and bicarbonate ions.

首先，固体碳酸钙与酸雨中的质子发生反应， 形成钙离子和碳酸氢根离子。

So for protection, our stomach cells generate a layer of mucus that's full of bicarbonate ions, which acts as a physical barrier that also neutralizes the harsh hydrochloric acid.

所以为了保护自己，我们的胃细胞会产生一层充满碳酸氢根离子的粘液，这就像一个物理屏障，也能中和极强的盐酸。

The kidneys help maintain the blood pH mainly by excreting hydrogen ions and reabsorbing bicarbonate ions as needed.

肾脏主要通过排出氢离子和根据需要重新吸收碳酸盐离子来帮助维持血液的pH值。

As long as protons are available, the bicarbonate ions can grab a second proton to become uncharged carbonic acid.

只要质子可用， 碳酸氢根离子就可以抓住第二个质子， 变成不带电的碳酸。

No matter how it gets there, carbon dioxide reacts with water to form carbonic acid; a weak acid that dissociates into hydrogen and bicarbonate ions.

无论它如何到达那里， 二氧化碳都会与水反应形成碳酸；一种离解成氢离子和碳酸氢根离子的弱酸。

For protection, our stomach cells generate a layer of mucus that’s full of bicarbonate ions, which acts as a physical barrier that also neutralizes the harsh hydrochloric acid.

为了保护身体，我们的胃细胞会产生一层充满碳酸氢根离子的粘液， 它充当物理屏障， 还能中和刺激性盐酸。

It'll stay blueish in color for as long as the bicarbonate ions are around to keep the pH buffered above the indicators end point of pH 4.

只要碳酸氢根离子在周围以保持 pH 值缓冲在 pH 值 4 的指示剂终点之上，它就会保持蓝色。

It'll stay blueish in color for as long as the bicarbonate ions are around to keep the pH buffered above the indicators end point of pH 4. This long glass thing here is a burette.

只要碳酸氢根离子在周围以保持 pH 值缓冲在 pH 值 4 的指示剂终点之上，它就会保持蓝色。这里的这个长玻璃东西是滴定管。