B2-Organisation 0.0 / 5 ? BiologyCirculationEnzymes and digestionHealthy livingMicrobes and diseasePhotosynthesis and transpirationGCSEAQA Created by: doowaDCreated on: 26-10-17 13:17 What is a tissue? A tissue is a group similar cells that work together to carry out a function 1 of 26 Explain what is meant by the term 'organ system' A group of organs working together to perform a function 2 of 26 Why can enzymes be described as catalysts? This is because they speed up the reactions inside living things 3 of 26 Why do enzymes usually catalyse one reaction? Enzymes only have one active site which is only complementary to one specific substrate 4 of 26 What does it mean when an enzyme has been 'denatured'? When the shape of the enzyme's active site changes so the substrate wont fit any more 5 of 26 List the three places where amylase is found in the body? Salivary glands, pancreas, small intestine 6 of 26 What is the role of lipases? To break down lipids into glycerol and fatty acids 7 of 26 Where is bile stored? In the gall bladder 8 of 26 Name the solution that you would use for testing the presence of proteins in a food sample Buiret Test 9 of 26 Where does the gas exchange happen in the lungs? In the Alveoli 10 of 26 Name the four chambers of the heart? Right Atrium & Left Atrium, Right Ventricle & Left Ventricle 11 of 26 Why does the heart have valves? To stop the blood from flowing backwards 12 of 26 How is the resting heart rate controlled in a healthy person? It is controlled by a group of cells in the right atrium wall.They act as a pacemaker and tell the heart when to pump. 13 of 26 How are arteries adapted to carry blood away from the heart? They have strong, elastic walls to deal with the high blood pressure. They have thick layers of muscle. They have elastic fibres to allow stretching. 14 of 26 Why do red blood cells not have a nucleus? To allow more space for carrying oxygen 15 of 26 Give an advantage and a disadvantage of statins Pro: Reduces risk of strokes and heart attacks Con: Takes time for their effect to work 16 of 26 What is a non-communicable disease? Cannot be spread between people or animals 17 of 26 What is a communicable disease? Can be spread between people and animals 18 of 26 What is meant by a risk factor for a disease? Things that are'nt linked to an increased chance of getting a certain disease. 19 of 26 Which type of tumour is cancerous-benign or malignant? Malignant 20 of 26 List the tissues that make up a leaf Upper Epidermis, Palisade layer, Spongy mesophyll, Stomata, Xylem and Phloem 21 of 26 Explain how the structure of the palisade layer in a leaf is related to its function It has lot's of chloroplasts which are near the top to get more light. 22 of 26 What are the functions of the phloem and xylem tubes? Xylem: takes up water Phloem: transports food 23 of 26 What is transpiration? Evaporation and diffusion of water from a plants surface 24 of 26 List the four main factors that affect transpiration Air flow, temperature, humidity, light intensity 25 of 26 Name the type of cell that cell that helps open and close the stomata Guard Cells 26 of 26
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