B2 Dissolved Substances Flashcards
1
Q
How do dissolved substances move in to and out of the 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 2 factors will affect the rate of diffusion?
A
Temperature.
Concentration.
4
Q
What is a concentration gradient?
A
A difference in concentration between 2 areas next to each other.
5
Q
Name 2 locations in the body where diffusion is important?
A
Lungs.
Small intestines.
6
Q
Which important gas passes through cell membranes into cells?
A
Oxygen.
