2d - movement of substances into and out of cells Flashcards
1
Q
what is diffusion?
A
the net movement of particles from an area of higher concentration to an area of lower concentration
2
Q
what is osmosis?
A
the net movement of water particles across a partially permeable membrane from an area of high concentration to an area of low concentration
3
Q
what is active transport?
A
the transfer of molecules across a cell membrane, against the concentration gradient, using energy from cell respiration
4
Q
which processes are passive processes: osmosis, active transport or diffusion?
A
diffusion and osmosis
5
Q
what are 4 factors that affect the rate of diffusion/osmosis?
A
- a grater concentration gradient
- a higher temp
- a greater surface area
- a shorter distance to travel
6
Q
when does the surface ares to volume ratio decrease?
A
when size increases
