Factor affecting pulse rate

1268 WordsOct 18, 20136 Pages
Biology Task To investigate the effect of some factor affecting pulse rate Aim TO investigate how exercise affects the pulse rate. To do this, we took our normal pulse rate and then compared it with the pulse rate after exercise (walking). We kept all other factors constant so as to study the effect of exercise on pulse rate. Introduction Our heart is a muscle. It's located a little to the left of the middle of our chest, and it's about the size of our fist. There are lots of muscles all over our body — in our arms, in our legs, in our back etc. But the heart muscle is special because of what it does. The heart sends blood around our body. The blood provides our body with the oxygen and nutrients it needs. It also carries away…show more content…
Oxygen is needed, the oxygen is carried in the haemoglobin of the red blood cell. The heart and lungs need to work harder in order to get a greater amount of oxygen to the muscles for respiration. In muscle cells digested food substances are oxidised to release energy. The heart rate rises because during exercise, respiration in the muscles increases, so the level of carbon dioxide in the blood rises. Carbon dioxide is slightly acid; the brain detects the rising acidity in the blood, the brain then sends a signal through the nervous system to the lungs to breathe faster and deeper. Gaseous exchange in the lungs increases allowing more oxygen into the circulatory system and removing more carbon dioxide. The brain then sends a signal to make the heart beat faster. As a result this, heart rate would rise. My graph confirms my hypothesis in that as the length of exercise is increased, the number of beats per minute rises. Hence the result shown by our experiment seems to be correct. Therefore I think that the procedure we used was reliable. Although there are some sources of error but these do not makes much difference and can be ignored. Sources of error As experiment is fully performed by humans so there are some human errors involved in the experiment. Firstly, we didn’t use pulse rate
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