In this experiment, the heart rate of a person (one of our group member) with different body position, which are lay quietly, sit quietly and standing up, are counted. Based on the result, the activity lay quietly has the lowest heart rate which is 80bpm while stand up quickly after one minutes has the highest heart rate which is 108bpm. The heart rate of lay quietly is lower than the heart rate of sitting quietly which is 88bpm. This is due to lying is in a horizontal position, it neutralizes the gravity. Hence, the heart doesn’t has to work as hard as in a vertical position. Therefore, the heart rate is lower. The heart rate of stand up quickly which is 104bpm is higher than the heart rate of siting down. When you are in a vertical position which is standing, the heart has to work harder to pump the blood to all parts of the body and back to the heart against the gravity. To overcome the effects of gravity, the heart has to beat harder. The heart rate of siting down quietly is lower than the heart rate of siting down quietly after one minute which is 96bpm while the heart rate of standing up quickly after one minute of standing up which is 108bpm is slightly higher than the heart rate of standing up quickly. The heart rate of siting down quietly after one minute and standing up after one minute has higher heart rate than the heart rate before one minute. The heart rate is counted immediately after changing position. It may due to the nervous system of the person doesn’t adjust properly to a different body position. The heart doesn’t respond quickly enough to the changing of body position. Therefore, the heart rate is lower (Johnson, 2011).