Transport In and Out of Cells
- Created by: Addison13
- Created on: 21-11-19 18:53
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- Transport In and Out of Cells
- Diffusion
- Is the net movement of particles from an area of higher concentration to lower concentration
- Spread out until they are evenly spread out
- Happens because particles move randomly and spread out
- Examples of diffusion in living organisms
- Oxygen and carbon dioxide diffuse during gas exchange in lungs, fills and plant leaves
- Digested food molecules from the small intestine diffuse into the blood
- Factors affecting Diffusion
- The concentration gradient
- The temperature
- The surface area of the membrane
- A single-felled organism has large surface area to volume ratio
- This allows enough molecules to diffuse into and out of the cell to meet the needs of the organisms
- In multicellular organisms there is a smaller surface area to volume ratio
- However surfaces and organ sysems are speculated for exchanging materials
- A single-felled organism has large surface area to volume ratio
- Osmosis
- Water may move across cell membranes by osmosis
- Is the diffusion of water from a dilute solution to a concentrated solution through a semi permeable membrane
- Active Transport
- Moves substances against a concentrationgradient
- From an area of low concentration to high concentration
- Requires energy from respiration
- Allows mineral ions to be absorbed into plant root hairs from dilute solutions in the soil
- allows sugar molecules to be absorbed from lower concentration in the gut into the blood, which has a higher concentration
- Moves substances against a concentrationgradient
- Diffusion
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