This is called the concentration gradient.

这称为浓度梯度。

The substance needs to move up the concentration gradient from a low concentration to a high concentration.

物质需要沿着浓度梯度从低浓度上升到高浓度。

In diffusion, particles move down the concentration gradient until they are evenly distributed.

在扩散过程中，粒子沿着浓度梯度向下移动，直到它们均匀分布。

Active transport moves molecules from a low concentration to a high concentration against the concentration gradient.

主动运输将分子逆着浓度梯度从低浓度移动到高浓度。

Just remember that for diffusion, the substance moves down the concentration gradient from a high concentration to a low concentration.

记住，对于扩散，物质沿着浓度梯度从高浓度向低浓度移动。

The rate of diffusion is directly proportional to the concentration gradient of each gas.

扩散速率与每种气体的浓度梯度成正比。

The blood needs to be taken away from the exchange area quickly so that you maintain the concentration gradient between the two areas.

血液需要迅速从交换区抽走，这样才能保持两个区域之间的浓度梯度。

You learned what a concentration gradient is, and finally, you learned how to do a precipitation reaction with gases.

您了解了浓度梯度是什么，最后，您了解了如何与气体发生沉淀反应。

That diffusion occurs across the respiratory membrane, and it's directly proportional to the concentration gradient of the gas and pressure.

这种扩散发生在呼吸膜上，它与气体浓度梯度和压力成正比。

This concentration gradient is extremely important for setting the resting membrane potential of excitable cell membranes, which is needed for normal contraction of smooth, cardiac, and skeletal muscle.

电化学梯度在可兴奋细胞膜静息电位的形成中十分重要，而平滑肌，心肌还有骨骼肌的收缩都需要可兴奋细胞膜的参与。

These pumps drive potassium from the blood into the cells and from there it flows down its concentration gradient into the tubule to be excreted as urine.

这些泵驱使钾从血液进入细胞内，细胞内的钾离子再顺着浓度梯度进入肾小管，以尿液形式排泄。

You can also have facilitated diffusion, where the movement is still down the concentration gradient but special carrier proteins are required to enable the movement.

你还可以促进扩散运动仍然沿着浓度梯度下降，但需要特殊的载体蛋白质来实现运动。

Depending upon what is being exchanged and which direction along the concentration gradient things are traveling will determine whether diffusion osmosis or active transport will be used.

根据交换的东西和沿着浓度梯度的方向，物体将决定是采用扩散渗透还是主动运输。

In this lesson, we will discuss how atmospheric pressure and concentration gradients of oxygen and carbon dioxide influence diffusion and, thus, gas exchange.

在本课中，我们将讨论大气压力和氧气和二氧化碳浓度梯度如何影响扩散，从而影响气体交换的。

Concentration gradients cause water to follow sodium, so we end up with the excess water being excreted in the urine with the sodium, normalizing the fluid volume in the blood.

（尿钠）浓度改变会导致水随着钠的排出而流出，最终多余的水从尿液中排出，血容量恢复正常。

Less water in the cells increases the intracellular potassium concentration, which increases potassium's concentration gradient, and pushes more of it out of the cell and into the interstitium and blood.

细胞内水分减少导致钾离子浓缩，升高了钾离子的浓度梯度，使更多钾离子从细胞内进入细胞间质和血中。

The rate of diffusion is determined by a variety of factors, including the concentration gradient of the gases and the partial pressure of the gases.

扩散速率由多种因素决定，包括气体的浓度梯度和气体的分压。

The rate of diffusion is influenced by a variety of factors, including atmospheric pressure and the magnitude of the concentration gradient of the diffusing substance.

扩散速率受多种因素的影响，包括大气压力和扩散物质浓度梯度的大小。

The air we breathe is a mixture of gases - nitrogen, oxygen, carbon dioxide, and even water - and each gas diffuses according to its own concentration gradient.

我们呼吸的空气是一种气体的混合物——氮、氧、二氧化碳，甚至水——每种气体都根据其浓度梯度扩散。

The difference in concentration between two points is called a concentration gradient, and it's kind of like a hill that matter rolls down, always moving from high to low.

两点之间的浓度差异称为浓度梯度，它有点像物质滚落的小山， 总是从高处向低处移动。