T1- Cell Transport Flashcards
1
Q
What is simple diffusion
A
The net movement of molecules from an area of high concentration gradient
2
Q
What molecules enter and leave cells via simple diffusion through the cell membrane
A
Small molecules e.g oxygen, water, glucose and amino acids
3
Q
What factors affect the rate of diffusion (3)
A
- temperature
- concentration gradient
- surface area of a cell membrane
4
Q
Define osmosis
A
The net movement of water molecules from an area of high water concentration to an area of low water concentration through a partially permeable membrane
5
Q
What is active transport
A
The movement of molecules across a cell membrane from an area of high concentration, against the concentration gradient, using energy
6
Q
How is a percentage change in mass calculated
A
% change = (final mass - initial mass)/initial mass x 100
