Blood , the transport of materials and oxygen dissacociation curves

revision notes on adaptations for tranport part 3 part 1 and 2 are on my resources as transport systems and the heart part 4 transport in plants soon to follow

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Blood and the transport of materials
20. Blood components carry gases haemoglobin carries oxygen as oxyhaemoglobin.

Blood is a tissue made up of 45% cells and 55% fluid
plasma. Plasma is 90% water with food molecules, waste
products, hormones, plasma proteins, mineral ions and
vitamins dissolved in it.
Blood cells:…

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The amount of oxygen depends on the partial pressure of both oxygen and
carbon dioxide.
When the respiratory pigment is exposed to a gradual increase in oxygen
tension it absorbs oxygen quickly at first but then more slowly giving rise to the
sigmoid shape of the curve.
If the curve…

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Carbon dioxide diffuses into the red blood cell and combines with the water to
form carbonic acid.
Carbonic acid disassociates into H + and HCO3- ions this reaction is catalysed
by carbonic anhydrase,
HCO3 diffuses out of the RBC and combine with Na+ ions found in the blood
plasma to…

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Capillaries are well adapted to allow the exchange of materials and the cells. In a
closed blood system exchange happens via tissue fluid.
Tissue fluid is formed because of the high hydrostatic pressure of the blood at the
arteriole end of the capillary that pushes fluid out of the blood.…

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