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Discover the effect of differing body states on the pulse rate of a 13/14 year old male. The body states are lying down, seated, standing up, jogging on the spot.

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Introduction

Background: The heart is the body's most important organ. Without it nothing would work. The heart has the tiresome job of pumping blood around the body non-stop. Without it, the human race wouldn't exist. Some areas need more blood then others, so the body's veins and arteries siphon off the blood accordingly. The heart is a muscular organ which pumps blood around the blood vessels (the heart and blood vessels together are called the cardiovascular system). It is surrounded by the pericardial sac. This consists of an outer membrane (the pericardium) and the cavity (pericardial cavity) between it and the heart. This cavity is filled with a cushioning fluid (pericardial fluid). ...read more.

Middle

In this investigation, the dependent variable is the BPM. The independent variable is the state in which the person is taking their pulse, i.e. standing, jogging on the spot etc. The dependent variable is the BPM (beats per minute). The controlled variable is the amount of time left between testing the BPM of two different body states. Equipment: Graph paper 13/14 year old male Stop clock Chair Method: 1. Select activity (lying down, seated, standing up, jogging on the spot). 2. Find pulse in wrist. 3. Begin counting the pulse at the same time as starting the stopwatch and starting the activity. 4. Time activity for one minute before stopping the stopwatch. ...read more.

Conclusion

Results: Activity BPM pulse 1 (BPM) BPM pulse 2 (BPM) Average pulse (BPM) Standing 70 74 72 Sitting 65 63 64 Jogging 96 100 98 Lying 44 39 41.5 Graph: See next page Conclusion: In conclusion, this investigation shows that a persons BPM increases the more strenuous the activity is likely to be. This proves my prediction right. Evaluation: I feel that the investigation ran very smoothly, however, if time had allowed, I would have liked to have run a few more tests to widen our information, in order for us to form a more accurate conclusion. For example, increasing the number of activities to test, and increasing the amount of times we tested the BPM. Christopher Nelson 9R Miss Warnock Biology Coursework ...read more.

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