B2.1.2 Dissolved substances Flashcards
1
Q
How do dissolved substances move in and out of cells?
A
Through cell membranes by diffusion
2
Q
What is the definition of diffusion?
A
The movement of particles from an area of high concentration to an area of low concentration through a semi-permeable membrane.
3
Q
What two factors will affect the rate of diffusion?
A
Temperature and 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 cell membranes into cells?
A
Oxygen
