Welcome dear student!
In this short course, you'll learn about cell transport: how things move in and out of a cell to facilitate the many chemical processes that take place in it.
You'll learn about active and passive transport, their mechanisms and utility, along with lots of examples.
At the end of this course, you'll be able to:
This is a very hands-on learning course. So gear up for some exciting sessions!
For an organism to remain alive, chemicals must be able to move in and out of cells. To be specific, all this activity occurs across the cell membrane, which is a protective layer that separates the cell from the outside.
A very thin layer of protein and fat makes up the cell membrane. It is semipermeable. Some experts prefer to call it "selectively" permeable because it lets certain molecules through but not others.
So, what are some of the things that go in and out of a cell? Both plants and animals take in and release gaseous substances (oxygen, carbon dioxide, water vapor) during respiration, photosynthesis, and excretion. Intake of nutrients and excretion of waste products are also facilitated by these processes.
Movement of substances across the membrane happens mainly in two ways:
In the next chapters we'll find out more about these.