7.3 Flashcards
How does a cell membrane keep the cell’s conditions relatively constant?
Regulating the movement of molecules from one side of the member to the other
What does every cell exist in?
A liquid environment
The process by which particles move from an area of high concentration to a lower concentration
Diffusion
What does diffusion mainly do?
To move substances across the cell membrane
When does diffusion kick in?
What particles are at a high concentration level and are uneven
The movement of materials across the cell membrane without using cellular energy
Passive Energy
When cells, such as glucose, cannot pass through the membrane directly. They use alternate route such as a protein carrier
Facilitated diffusion
Cells contain water channel proteins known as____ that allow water to pass right right through them
Aquaporins
Why is it so hard for water to move through cell membrane?
Because it has water in the bilayer
The diffusion of water through a selectively permeable membrane
Osmosis
Water molecules are equal
Isotonic
Water outside the cell more
Hypertonic
Water moving more in
Hypotonic
The movement of materials against a concentration difference
Active transport
How do small proteins get pushed throught the membrane?
Protein pumps
