Transport in Cells 0.0 / 5 ? BiologyTransport in CellsGCSEAQA Created by: holly.preston12345Created on: 13-12-18 11:51 What is diffusion? Movement of particles in a solution or gas from a higher to a lower concentration 1 of 22 For diffusion is energy required? No 2 of 22 Give an example of diffusion: O2 and CO2 in gas exchange, urea in kidneys 3 of 22 What factors affect the rate of diffusion? Concentration, temperature and surface areC 4 of 22 The greater difference in... in concentrations the faster the rate of diffusion 5 of 22 How is the small intestine adapted for diffusion? Villi – increase surface area, Good blood supply – to maintain concentration gradient, Thin membranes – short diffusion distance 6 of 22 How is the lungs adapted for diffusion? Alveoli– increase surface area, Good blood supply – to maintain concentration gradient, Thin membranes – short diffusion distance 7 of 22 How is gills in a fish adapted for diffusion? Gill filaments and lamella – increase surface area, Good blood supply – to maintain concentration gradient, Thin membranes – short diffusion distance 8 of 22 How is roots adapted for diffusion? Root hair cells - increase surface area 9 of 22 How is leaves adapted for diffusion? Large surface area, thin leaves for short diffusion path, stomata on the lower surface to let O2 and CO2 in and out 10 of 22 What is Osmosis? The diffusion of water from a dilute solution through a partially permeable membrane 11 of 22 What is a partially permeable membrane? A membrane that is permeable to the small molecules of water and certain solutes but does not allow the passage of large solute molecules 12 of 22 Is energy required fo osmosis? No 13 of 22 What would be an osmosis response to why the bag got heavier? Water molecules move into the bag by osmosis because the water concentration inside is lower than the water concentration outside the bag 14 of 22 What does the direction of osmosis depend on? The concentration of solution outside of the cell 15 of 22 If it is a dilute solution it is... high concentrated 16 of 22 If it is a light solution it is... dark solution 17 of 22 What is active transport? Movement of particles from a dilute solution to a more concentrated solution 18 of 22 Give an example of active transport? Movement of mineral ions into roots of plants and the movement of glucose into the small intestines 19 of 22 Is energy needed for active transport? Yes 20 of 22 What are the 3 types of an osmosis solution? Hypertonic, Hypotonic and Isotonic 21 of 22 What is hypertonic? A solution that causes a cell to shrink because of osmosis 22 of 22
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