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An investigation into pulse rates
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| Submitted: Tue Aug 12 2003
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Monday, December 16, 2002 Jack Jackson An investigation into pulse rates Introduction A pulse is the stretching of an artery each time your heart beats. So a pulse is the blood being pushed around our bodies and we can feel it when the veins are close to our skin. The atria contract and they squeeze the blood into the ventricles, then the ventricles then contract pushing the blood into the arteries. The valves in the heart make sure the blood flows the right way and this is what we feel around our body as a pulse. Anaerobic respiration occurs when the diffusion of oxygen and carbon dioxide in the alveoli can't keep up with the amount we need. This happens when the trachea divides into two tubes called the bronchi which divide again several times, to form the bronchioles which continue to divide until they end as air sacs called alveoli there are millions of...
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