Summary:
This video talks about the different types of diffusion and active transport, and compares them. Simple diffusion, facilitated diffusion, and active transport all allow materials to pass through membranes. Both simple diffusion and facilitated diffusion require a concentration difference, go from high to low concentration, and do not use energy from the cell, instead using energy from its environment. Simple diffusion is when small, non-polar molecules pass through the cell membrane into the cell, requiring no activity of the cell. Facilitated diffusion has to have protein channels, and involves a carrier protein. The material coming through binds to the carrier protein, and the carrier protein closes the outer part, and opens the inner part to let the material to come through in to the cell. Active transport is like facilitated diffusion, however, active transport requires energy from ATP, and moves materials against a concentration difference, from low to high concentration.
Relevance to Class:
In class, we have learned about simple diffusion, facilitated diffusion, and active transport. This video is helpful for anyone who needs more help distinguishing between simple diffusion, facilitated diffusion, and active transport. It also describes simple diffusion and facilitated diffusion more in depth, and touches upon active transport.
Video Information
Author: John C. Jones
Date: January 17, 2012
How does a cell remove particles that it doesn't want there?
ReplyDeleteA cell removes unwanted particles using active transport and diffusion.
DeleteWhy is active transport needed . . . why would we need to move materials from low to high concentration at all?
ReplyDeleteActive transport is needed for materials that cannot move in and out of the cell using diffusion. For example, in the roots of the plants, active transport is used to obtain nutrients.
Delete