As the The heart is a large muscular organ that pumps blood throughout the body. Valves inside the heart open and close with blood flow. This controls how much blood will enter or leave the heart. Oxygen rich blood enters the heart from the lungs and goes out to the rest of the body while poor oxygenated blood enters the heart from the body and goes to the lungs. A heartbeat has two parts. They are sometimes called lubb and dubb. A lubb happens when the upper chambers of the heart contract to squeeze the blood ownward into the ventricles.

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A dubb happens when the lower chambers contract. The pulse can be felt anywhere an artery passes close to the skin. The common places a pulse can be felt are the wrist, neck, temple, behind the knees, and on top of the foot. From the experiment to test the effect of exercise on the heart, the pulse was felt in the wrist; the index and middle finger were placed over the underside of tne suDJecrs wrlst, Delow tne oase 0T tne tnumD. It was pressed Tlrmly wltn fingers until the pulse was felt. The subject’s body temperature increased during the orkout, which was likely to increase the heart rate.

This is because your heart has to send blood to your skin to cool you down while at the same time it continues to supply blood to your working muscles. While exercising, the muscles needed more oxygen in order to create more energy through cellular respiration. In order to supply more oxygen, the heart was beating faster so blood moved faster throughout the body so the subjects pulse rate increased because every time the lower chambers of the heart contracted, the blood in the left ventricle rushed upwards into the aorta.

It quickly speeds away from the heart which caused the aorta to expand as it passed. As the blood raced along, some of it was pushed into the first artery that branches off from the aorta. Some of the blood enters the next artery. And as a result arteries that

Page 2 Exercise/pulse rate Essay

passed close to the subject’s skin could be felt as a pulse because the blood from each contraction of the heart produces a bulge in the artery. We call that bulge a pulse. One pulse is equal to one heartbeat. Conclusion: It can be concluded that your heart rate increases rapidly in proportion to your exercise intensity.

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