Biology Course Work. Effect of Exercise on Heart Rate. Aim: The aim of this experiment is to find out how different intensities of exercise effect the heart rate I will measure it in beats per minute using a polar heart rate monitor. Hypothesis: I predict that as I increase the intensity of the exercise I do, that my heart rate will increase. This is because as I exercise more intensely I will need more blood …showed first 75 words of 1427 total…

…showed last 75 words of 1427 total…and reaches the atrioventricular node. The atrioventricular node delays the impulse to allow completion of atrial contraction. The impulse then spreads down the bundle of His and branches off in purkinje fibres. Then this impulse will cause ventricular systole where the ventricles contract. This shows how my pulse was created and when the cardiac pacemaker changes the pace of the heart it changes the beats per minute and that is why the heart rate increases.