B1.6 Diffusion Flashcards
1
Q
What is diffusion?
A
The spreading out of particles in a gas or a substance in a solution, with a net movement from an area of high concentration to an area of lower concentration.
2
Q
What is concentration gradient?
A
The difference in concentration between two areas
3
Q
What is the relationship between concentration gradient and rate of diffusion?
A
Larger concentration gradient = faster rate of diffusion
4
Q
What determines the net movement of particles across a cell membrane?
A
The concentrations of the particles on either side of the membrane
5
Q
What factors affect rate of diffusion?
A
Temperature
Concentration gradient
Available surface area
6
Q
Describe what is meant by gas exchange?
A
The diffusion of oxygen and carbon dioxide in opposite directions in the lungs
