Transport In and Out of Cells
- Created by: Jxss.lx
- Created on: 09-06-18 19:06
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- Transport In and Out of Cells
- Diffusion
- Across cell membranes
- Net movement of particles
- From higher concentration to lower concentration
- Until evenly spread out
- From higher concentration to lower concentration
- Particles move randomly and spread out
- Examples
- Oxygen and carbon dioxide
- Gas exchange in lungs, gills and plant leaves
- Urea
- Diffuses from cells into blood plasma
- Excretion by kidney
- Diffuses from cells into blood plasma
- Digested food molecules
- From small intestine into blood
- Oxygen and carbon dioxide
- Factors affecting rate
- Concentration gradient
- Surface area of membranes
- Single-celled organism
- Large surface area to volume ratio
- Allows enough molecules to diffuse to meet needs of organism
- Large surface area to volume ratio
- Multi-cellular organisms
- Smaller surface area to volume ratio
- Surfaces and organ systems specialised
- Large surface area
- Thin surface
- Short distance for molecules to diffuse
- Kept moist
- Dissolve quicker
- Animals
- Rich blood supply
- Maintains concentration gradient
- Ventilation occurs
- Speeds up gaseous exchange
- Rich blood supply
- Surfaces and organ systems specialised
- Smaller surface area to volume ratio
- Single-celled organism
- Temperature
- Osmosis
- Water
- Across cell membrane
- Diffusion of water
- From dilute solution to concentrated solution
- Through partially permeable membrane
- From dilute solution to concentrated solution
- Water
- Active Transport
- Moves substances against concentration gradient
- Area of lower concentration to higher concentration
- Requires energy
- From respiration
- Allows
- Mineral ions to be absorbed into plant root hairs
- From very dilute solutions in soil
- Sugar molecules from gut to blood
- Mineral ions to be absorbed into plant root hairs
- Moves substances against concentration gradient
- Diffusion
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