The effect of exercise on the body B3 topic - how exercise affects the body 3.0 / 5 based on 1 rating ? BiologyRespiration and exerciseGCSE Created by: Marianne BradleyCreated on: 04-05-09 10:58 Increased Breathing rate and depth We breathe at a higher rate Each breath is deeper This is to ensure more oxygen gets in and more CO2 gets out Respiring tissue needs to be supplied with Oxygen for AEROBIC respiration It is preferable to respire anaerobically because this kind of respiration is 16x more efficient than anaerobic respiration The oxygen debt must be repaid to oxidise lactic acis into water and carbon dioxide Glycogen is stored in the muscles - used in respiration. Myoglobin - last store of oxygen - pigment in the muscles 1 of 3 Increased heart rate This increases blood flow around the body This enables oxygen to reach the respiring muscles more quickly and carbon dioxide to be disposed of more quickly HOWEVER, there is NOT more blood in the body - it is just diverted from areas such as the stomach which are not as essential during exercise 2 of 3 Arteries dilate The arteries are able to dilate because they contain muscle tissue Because the heart is beating faster, the blood is forced through the arteries more (for lack of a better word!) note well - the capillaries CANNOT dilate as they don't contain elastic tissue The dilation of the arteries increases blood flow to the muslces - but as before, there is not more blood in the body, it is just being diverted. 3 of 3
Comments
No comments have yet been made