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8. Transport in mammals
A section of Biology, 9700
Listing 10 of 589 questions
shows some of the events that occur when a red blood cell flows through a capillary in the lungs. Cl – HCO3 – HCO3 – + H+ H2CO3 CO2 + H2O CO2 O2 HbO2 + H+ X + O2 carbonic anhydrase plasma red blood cell State why there are transport proteins in the membranes of red blood cells to allow the movement of hydrogencarbonate ions (HCO3 –) and chloride ions (Cl –). shows that chloride ions move out of the red blood cells. Explain why this movement is necessary when red blood cells flow through capillaries in the lungs. State why carbon dioxide molecules diffuse from the red blood cells into the plasma. State the name of the compound indicated by X.
9700_w22_qp_23
THEORY
2022
Paper 2, Variant 3
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Questions Discovered
589