Movement of molecules in and out of cells 1.0 / 5 based on 1 rating ? BiologyCells, tissues and organsGCSEAQA Created by: Katie BrownCreated on: 05-05-13 22:39 What is osmosis? Diffusion of water from a high concentration to a low concentration through a partially permeable membrane. 1 of 15 What do most soft drinks contain? Water, Sugar and Ions. 2 of 15 What happens if the water and ions in your body are not replaced? The ion / water balance of the body is disturbed and the cells do not work as efficiently. 3 of 15 What is active transport? When a substance is absorbed up a concentration gradient. It requries energy from respiration. 4 of 15 How can the effectiveness of an exchange surface be increased? Large surface area, thin (for a short diffusion path), efficient blood supply, ventilated for gaseous exchange. 5 of 15 How is the surface area of the lungs increased? by the alveoli 6 of 15 How is the surface area of the intestines increased? by the villi 7 of 15 How does carbon dioxide enter the leaves? through diffusion 8 of 15 How is water and mineral ions absorbed by plants? through the roots 9 of 15 How is the surface area of the roots increased? root hairs 10 of 15 How is the surface area of the leaves increased? the flattened shape and internal air spaces 11 of 15 What are stomata for in plants? to obtain carbon dioxide from the atmosphere and remove oxygen produced in photosynthesis 12 of 15 How is water lost in plants? Throught the stomata in the leaves 13 of 15 How can the stomata prevent wilting? They can close to prevent any more water being lost 14 of 15 What controls the size of the stomata? the guard cells 15 of 15
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