2.6 Aerobic & Anaerobic respiration

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Presentation transcript:

2.6 Aerobic & Anaerobic respiration According to the most widely accepted model to be classified as living there are 7 key life processes M R S G E N Respiration allows e______ to be released (NOT made) from the sugar g……... Where does respiration take place? On which structures in the cell does respiration happen? Where are these structures found within the cell? Chemical reactions take place in the cytoplasm. What controls all chemical reactions? Explain simply why it is important for all cells to regulate their temperature. Is there any difference in respiration between plants and animals? How is the energy released used? to build l……….. molecules from s………. ones e.g. glycogen from ……. .molecules in animals, to enable m………to c………. in mammals and birds (w……. blooded), to maintain a s….… body t……………….. in colder surroundings in plants, to build up sugars, n………….. and other nutrients into a……... acids which are then built up into p…………. 2.6 Aerobic & Anaerobic respiration Write a word equation for aerobic respiration. Describe the changes in the body that take place when you exercise. H………. r….. increases Rate and d……. of breathing i…………. Arteries supplying muscles w…….. / dilate. Arteries going to the s…… dilate / widen Glycogen in muscles is broken down into g…….. Increase in s…………. at the skin Explain the changes that happen when you exercise. Faster transport / supply of ………….. and ……………. to m…………. cells Faster removal of …………… ………….and …………….. ………….. from cells Increased rate of d……………….. of oxygen and carbon dioxide at the lungs Faster rate of r………………… in cells releasing e……………… faster. Faster release of h……. from the body preventing e……………. from denaturing Why might aerobic respiration stop? Word equation for anaerobic respiration. Why is anaerobic respiration not as useful to cells as aerobic respiration? - ………. …….. is made (which causes muscle fatigue) and is released into the b……., - …….. energy is released as the breakdown of glucose is i………………, - an o………….. ……… builds up What happens to the lactic acid? It must be oxidised (repay the oxygen debt) into ………….. …………. and w……..

2.6 Aerobic & Anaerobic respiration According to the most widely accepted model to be classified as living there are 7 key life processes Movement Respiration Sensitivity Growth Reproduction Excretion Nutrition Respiration allows energy to be released (NOT made) from the sugar glucose Where does respiration take place? In all living cells On which structures in the cell does respiration happen? mitochondria Where are these structures found within the cell? In the cytoplasm Chemical reactions take place in the cytoplasm. What controls all chemical reactions? enzymes Explain simply why it is important for all cells to regulate their temperature. The enzymes would denature, respiration would stop happening and the cell dies. Is there any difference in respiration between plants and animals? No. It happens day and night in all cells How is the energy released used? to build larger molecules from smaller ones e.g. glycogen from glucose in animals, to enable muscles to contract in mammals and birds (warm blooded), to maintain a steady body temperature in colder surroundings in plants, to build up sugars, nitrates and other nutrients into amino acids which are then built up into proteins 2.6 Aerobic & Anaerobic respiration Write a word equation for aerobic respiration. Glucose + oxygen carbon dioxide + water (+energy) Describe the changes in the body that take place when you exercise. Heart rate increases Rate and depth of breathing increases Arteries supplying muscles widen / dilate. Arteries going to the skin dilate / widen Glycogen in muscles is broken down into glucose. Increase in sweating at the skin Muscles contract / respire faster Explain the changes that happen when you exercise. Faster transport / supply of glucose and oxygen to muscle cells Faster removal of carbon dioxide and lactic acid from cells Increased rate of diffusion of oxygen and carbon dioxide at the lungs Faster rate of respiration in cells releasing energy faster. Faster release of heat from the body preventing enzymes from denaturing Why might aerobic respiration stop? Oxygen may not get to the cells quickly enough and energy is still needed. The muscles stop contracting as efficiently. Word equation for anaerobic respiration. Glucose lactic acid ( + energy) Why is anaerobic respiration not as useful to cells as aerobic respiration? - Lactic acid is made (which causes muscle fatigue) and released into the blood, - less energy is released as the glucose is not fully broken down, - an oxygen debt builds up What happens to the lactic acid? It must be oxidised (repay the oxygen debt) into carbon dioxide and water