6.2 The body, the lungs and oxygen

The figure shows a simple image of how the lungs absorb oxygen from the air.

Figure 11
Figure 11 Air and blood flow

4.4 Maximum heart rate

The other part of an efficient heart is the maximum rate that it can beat. If we think about competitors in a race that takes about five minutes, the athlete whose heart can beat at 200 times per minute for five minutes will probably do much better than one whose heart can only beat at 180 times per minute.

This is linked to how much blood is pumped with each beat. If an individual's heart doesn't pump very much blood when they are resting, then the heart rate has to increase so
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4.3 Measuring your heart rate

The most common way of measuring heart rate is by feeling the pulse at one of the arteries. The pulse is quite literally that – a pulse of blood running through the artery each time the heart does one pumping motion.

Figure 6
Fi
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