Unit 3 0.0 / 5 ? BiologyActive transport and Exchange surfacesGCSEAQA Created by: Kasper GeeCreated on: 10-05-15 17:23 Active transport requires what? Energy. 1 of 20 Where does active transport move molecules? Against the concentration gradient. 2 of 20 Where does the energy needed for active transport come from? Cell respiration. 3 of 20 Why is active transport used by root cells? To absorb minerals, like nitrates, from dilute concentrations in soil. 4 of 20 What transports molecules from surroundings into the cell? Special proteins in the cell membrane. 5 of 20 Where does cell respiration occur? In the mitochondria. 6 of 20 What happens in cell respiration? Glucose is broken down and combined with oxygen to release energy. 7 of 20 What do cells that do a lot of active transport have lot of? Mitochondria. 8 of 20 Where do root hair cells absorb oxygen from? Air spaces in the soil. 9 of 20 What are exchange surfaces used for? Taking in substances from surroundings and getting rid of other substances. 10 of 20 Where are exchange surfaces found? In the lungs, intestines and kidneys. 11 of 20 Why does the small intestine have villi? To absorb nutrients from food into the blood. 12 of 20 Why do the lungs have alveoli? To absorb oxygen from the air and release carbon dioxide from the blood. 13 of 20 Why do the kidneys have nephrons? To get rid of urea from the blood. 14 of 20 What does villi have? A large surface area. 15 of 20 Which exchange surface has a small distance for diffusion? Flattened cells in the alveoli. 16 of 20 What does blood get pumped through to maintain a concentration gradient? Through nephrons in the kidneys. 17 of 20 How does villi adapt the small intestine? It folds in intestine lining which increases surface area. 18 of 20 Why is there a small distance for diffusion in the small intestine? The small intestine has thin walls. 19 of 20 How does the small intestine maintain the concentration gradient? It has a dense network of blood capillaries to move the nutrients away. 20 of 20
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