Dogs Circulatory Systems Why the heart rate increases during exercise? From the graph it shows that the heart rate of the dog increases during exercise, while the dog is exercising the heart pumps faster getting blood to the moving joints, making the dog breath faster to get the needed oxygen around the body. The dog also gets adrenalin which also makes the heart work harder and making the dog excitable. Why does it take a while to return to normal? It takes a while for the heart rate to return to normal after exercising because the dog still had adrenalin around the body and it takes awhile for the heart to stop pumping faster and for the breathing to go back to normal this is because the adrenalin needs to wear-down in the system. The dog’s circulatory and respiratory system during exercise and during rest. In the dogs body the circulatory and respiratory system work hard making sure that what the dog needs is getting around the body, for the respiratory system the dog is breathing much harder and faster then normal taking in more oxygen, making the lungs work quicker and harder. For the circulatory system, as the dog runs around it makes the heart work faster pumping oxygenated blood around the body, to the areas that need it. After exercise bother systems slow down slowly, the heavy breathing gets softer, less oxygen is taken in and the fast heart rate slows down, less blood is pumped around making it go back to normal. Written by http://www.diyconservatories-and-windows.co.uk/

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