Biology Unit 3 0.0 / 5 ? BiologyUnit 3 specificationGCSEAQA Created by: CaitlinLeachCreated on: 12-03-14 21:57 Why are cells, tissues and organs adapted? To take up and get rid of dissolved substances, conditions can affect the rate of transfer, which sometimes needs energy. 1 of 20 What do dissolved substances move by? Diffusion and active transport. 2 of 20 What is Osmosis the diffusion of water from a dilute to more concentrated solution, through a partially permeable membrane. 3 of 20 What contains sugar, water and ions. Sports drinks 4 of 20 When the ion and water balance is disturbed what happens? cells do not work as efficiently. 5 of 20 What does Active Transport do? enables cells to absorb ions from very dilute solutions 6 of 20 How is and exchange surface made to be more efficient? A large surface area, being thin for a short diffusion path, an efficient blood supply and being ventilated. 7 of 20 What increases the difficulty of exchanging materials? size and complexity 8 of 20 In the lungs, surface area is increased by? Alveoli. 9 of 20 In the small intestine, surface area is increased by? Villi, with an extensive network of capillaries to absorb through diffusion and active transport 10 of 20 What are the lungs protected and separated by? The ribcage and the diaphragm. 11 of 20 What happens to make air move in and out of the lungs? the ribcage moves up and out and the diaphragm flattens. The changes then reverse to breathe out. 12 of 20 How does carbon dioxide enter leaves? diffusion. 13 of 20 How is the surface ares of roots and leaves increased? Root hairs, and for leaves, flattened shape and internal air spaces. 14 of 20 Why do plants have stomata? to obtain carbon dioxide from the atmosphere and remove oxygen in photosynthesis 15 of 20 In what conditions is evaporation increased? Windy, hot and dry. 16 of 20 What helps to cool the body? sweating. 17 of 20 What is body temperature controlled by? Thermoregulatory centre, which has receptors sensitive to blood temperature. 18 of 20 What happens if core body temperature us too high? Blood vessels supplying skin capillaries dilate, so more blood flows through and heat is lost through radiation. 19 of 20 What happens when core body temperature is too low? Blood vessels supplying skin capillaries constrict to reduce flow. 20 of 20
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