Investigating Pulse Rates Introduction============In this experiment I will examine pulse rates and the factors that influence them. Every time the heart or cardiac muscle contracts it registers a beat. The pulse is caused by the action of the heart pumping blood throughout the body. Depending on the amount of blood pumped through the arteries, the arteries expand and contract, and the blood pumped through the arteries causes a pressure wave that you feel as a pulse. You can check your pulse in several places: · Just above your temple, on the side of your head, this is known as the "temporal pulse." · At the base of the thumb, on the inside of the wrist, is known as the "radial pulse". pulse". · On both sides of the neck, this is known as the "cartoid pulse". · Inside the groin, this is known as the "femoral pulse". The heart needs to pump blood throughout the body because ; the blood contains hemoglobin, which carries oxygen, to the muscle tissue for breathing. Factors to investigate The factor I will examine is how the duration of exercise affects the heart rate. During my investigation I will use a stopwatch. an exercise phase, comfortable shoes and a safe area to exercise. Prediction I think the longer I exercise, the higher my heart rate will be I think because the muscles contract faster during exercise , which means they will need more energy. The muscles get their energy from breathing, which uses glucose and oxygen, contained in the blood. To obtain the necessary glucose and oxygen, the heart will have to pump faster, causing an increase of heart rate. Method I will work safely while carrying out the investigation by wearing comfortable shoes, not exercising for too long a period, resting between tests, warming up before exercise and practicing in a safe