Bio - Transport In and Out of Cells
- Created by: caitlinpm
- Created on: 18-06-17 19:31
View mindmap
- Transport In and Out of Cells
- Diffusion
- Movement of particles from a high concentration to a low concentration
- Examples of diffusion in living organisms
- Oxygen and carbon dioxide during gas exchange in lungs, gills and plant leaves
- Urea diffuses from the cells into the blood plasma for excretion by the kidney
- Digested food molecules from the small intestine diffuse into the blood
- Factors affecting diffusion
- Difference in concentration gradients
- Temperature
- The surface area of the membrane
- A single celled organism has a large surface area to volume ratio
- This allows enough molecules to diffuse into and out of the cell to meet the needs of the organism
- Osmosis
- Diffusion of water molecules from a low to a high concentration through a partially permeable membrane
- Active Transport
- Moves substances against a concentration gradient from a low to a high concentration
- This requires energy from respiration
- Allows mineral ions to be absorbed into plant root hairs
- Allows sugar molecules to be absorbed in the gut into the blood
- Moves substances against a concentration gradient from a low to a high concentration
- Diffusion
Comments
No comments have yet been made