B2.1.2 Flashcards
1
Q
How do dissolved substances move in and out of cells?
A
Through the cell membrane by diffusion.
2
Q
What is the definition of diffusion?
A
The movement of particles from area of high concentration to an area of low concentration through the semi-permeable membrane.
3
Q
What two factors will affect the rate of diffusion?
A
1) Temperature
2) Concentration
4
Q
What is a concentration gradient?
A
A difference in concentration between two areas next to each other.
5
Q
Name two locations in the body where diffusion is important?
A
Lungs and small intestines
6
Q
Which important gas passes through the cell membrane and into cells?
A
Oxygen