The heart consists of four chambers in which blood flows. Blood enters the right atrium and passes through the right ventricle. The right ventricle pumps the blood to the lungs where it becomes oxygenated. The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium. From the left atrium blood flows into the left ventricle
The prevention of second-hand smoking.
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The intermittent recovery test differs from the intermittent endurance test in that, instead of using a twenty-two and a half meter long strip of floor space, it uses twenty-five meters. The extra two and a half meters are added to the shorter section, making a five-meter section for the active break period.
