The circulatory system between the heart and lungs
Pulmonary Circuit
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The circulatory system between the heart and the other organs
Systemic circuit
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When carbon dioxide diffuses from the blood into the air in the alveoli.
Gaseous Exchange
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Carry blood away from the heart (always oxygenated apart from the pulmonary artery which goes from the heart to the lungs And have thick muscular walls.
Arteries
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Have thin walls and have larger passageways for blood (internal lumen).
Veins
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Found in the muscles and lungs and are microscopic – one cell thick.
Capillaries
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A muscular organ. Its function is to pump blood.
Heart
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The coronary arteries supply blood to the heart muscle. These may become blocked by a build-up of fatty plaques containing cholesterol, resulting in
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