1.4 Diffusion Flashcards
0
Q
What is diffusion?
A
The spreading out of the particles of a gas, or of any substance in solution
1
Q
Why do molecules in gases and liquids move around randomly?
A
Because of the energy they have
2
Q
What does the net movement into or out of cells depend on?
A
The concentration of the particles on each side of the cell membrane
3
Q
What is the difference in concentration between two areas called?
A
The concentration gradient
4
Q
The larger the difference in concentration…
A
…the faster the rate of diffusion
5
Q
Three examples of diffusion:
A
- The diffusion of oxygen into the cells of the body from the bloodstream as the cells are respiring (and using up oxygen)
- The diffusion of carbon dioxide into actively photosynthesising plant cells
- The diffusion of simple sugars and amino acids from the gut through cell membranes
6
Q
What is net movement?
A
The overall movement
7
Q
what are amino acids?
A
They are the building blocks of protein
