细胞运输概述_细胞运输

细胞主动运输
视频：细胞主动运输

细胞被动运输
视频：被动运输

Cell transport is the process of how things move in or out of the cell through the cell membrane.

细胞运输是物质通过细胞膜进出细胞的过程·

There are two broad categories of cell transport.

细胞运输有两大类·

The first category is passive transport.

第一类是被动运输·

For a cell passive transport means it's an automatic process that doesn't require any input of energy.

对于细胞来说,被动运输意味着它是一个自动的过程,不需要输入任何能量·

For example diffusion is a passive process in which particles move either into or out of the cell from an area of higher concentration to an area of lower concentration.

例如,扩散就是一种被动过程,在此过程中,粒子从高浓度区域向低浓度区域进出细胞·

The cell doesn't use any energy when this happens.

当这种情况发生时,细胞不消耗任何能量·

The second category of cell transport is active transport.

细胞运输的第二类是主动运输·

This is when particles move from an area of lower concentration to an area of higher concentration.

主动运输是指粒子从低浓度区域移动到高浓度区域的情况·

When particles move against the concentration gradient energy is required often to allow protein pumps to assist in particle movement.

当粒子逆浓度梯度移动时,通常需要能量来让蛋白质泵协助粒子移动·

Why would the cell need to move particles from a low to high concentration and expend energy to do it An important example is seen in your heart muscle cells.

细胞为什么需要将粒子从低浓度区域移到高浓度区域并为此消耗能量呢?在你的心肌细胞中就有一个重要的例子·

In order for your heart to beat there are certain molecules that have to move from an area of low concentration to an area of high concentration for those cardiac muscle cells to work.

为了让心脏能够跳动,某些分子必须从低浓度区域移动到高浓度区域,这样心肌细胞才能正常工作·

So the main things to remember are passive transport happens automatically with no energy required while active transport needs energy for it to occur.

所以,要记住的主要内容是：被动运输自动发生,不需要能量,而主动运输则需要能量才能发生·