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 Gas exchange 

 Gas exchange . Shona  Jack !. Copy into jot’s pwweeaase. Draw into jotters.

euclid
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 Gas exchange 

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  1. Gas exchange  ShonaJack!

  2. Copy into jot’s pwweeaase

  3. Draw into jotters Gas exchange in the alveolus. Blood enters the lungs low in oxygen and high in carbon dioxide. The carbon dioxide diffuses from the blood to the alveolus, where carbon dioxide levels are low. Oxygen diffuses from the alveolus, where oxygen levels are high, into the blood where the level is low, so blood leaves the lungs high in oxygen and low in carbon dioxide.

  4. Capillary network • Capillaries are very narrow tubes which branch repeatedly. • They form a such a dense network that every living body cell is close to a capillary • Capillary walls are one cell thick which allows efficient gas exchange to occur between the bloodstream and the body cells.

  5. haemoglobin • The pigment in the red blood cells are called haemoglobin. • In the presence of a high concentration of oxygen, haemoglobin readily combines with the oxygen to form oxy-haemoglobin. • When the surrounding concentration of oxygen is low, oxy-haemoglobin readily releases the oxygen again. • As blood passes through the lung capillaries, oxy-haemoglobin is formed.

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