Biology 9700 · AS & A Level · Movement into and out of cells

Movement into and out of cells — practice question

What is the explanation for how the greatest volume of oxygen is absorbed while blood flows through the lung capillaries?

  • AEach haemoglobin molecule can temporarily bind to four oxygen atoms.
  • BThe dissociation of carbon dioxide from carboxyhaemoglobin allows more haemoglobin to be available for binding oxygen.
  • CThe binding of the first oxygen molecule to haemoglobin decreases the affinity of haemoglobin for binding other oxygen molecules.
  • DOxyhaemoglobin formation increases the ability of red blood cells to transport oxygen.

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI