B1.6 - Diffusion Flashcards
1
Q
Diffusion
A
- physical process involving the movement of substances
- spreading out of particles of a gas/any substance in a solution
- particles move from a high concentration to a low concentration
- resulting in the net movement of particles
- is a result of the random movement of particles in any direction
2
Q
Molecules
A
- groups of atoms
- eg H2O
3
Q
Ions
A
Positively charged or negatively charged atoms
-eg na+
4
Q
Net movement formula
A
Particles moving in - particles moving out
5
Q
Concentration gradient
A
The difference between two areas of concentration
-diffusion occurs down a concentration gradient
6
Q
The steeper the concentration gradient…
A
The faster the rate of diffusion
7
Q
Temperature in diffusion
A
- increase in temp causes the particles to heat up and become energised to move quicker
- increasing rate of diffusion
8
Q
Ways of increasing diffusion
A
- increasing concentration
- increasing temperature
- increasing surface area
9
Q
Increasing surface area example
A
- no nucleus
- folds in the membrane called villi
10
Q
Process of diffusion involving glucose, small intestine, bloodstream
A
- small intestine is lined with villi increasing surface area
- high concentration of glucose causes diffusion to occur down a concentration gradient
- rich blood supply maintains concentration gradient as the blood quickly carries it away
11
Q
Process of diffusion within your blood and lungs
A
- high concentration of co2 in the blood
- low concentration of co2 in your lungs
- diffusion takes place down a concentration gradient
- large surface area of alveoli increases diffusion
- rich blood supply maintains concentration gradient
