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Learning objective

Explain haemoglobin structure and oxygen transport.

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Topic

Exchange substances official content

Subtopic

Mass transport in animals

Aqa A Level BiologyOrganisms exchange substances with their environment

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Quick explanation

Explain haemoglobin structure and oxygen transport

  • This point belongs to Exchange substances official content, especially Mass transport in animals.
  • You need to be able to explain haemoglobin structure and oxygen transport.
  • The key ideas to know are haemoglobin.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

haemoglobin

Why it matters

This objective helps connect Mass transport in animals to exam-style questions, flashcards, and revision notes for Exchange substances official content.

Quick student answer

What is the primary function of hemoglobin in red blood cells?

Direct answer

Hemoglobin primarily functions to transport oxygen from the lungs to the tissues.

Key terms

  • Hemoglobin: A globular protein in red blood cells that binds oxygen for transport from the lungs to tissues.
  • Oxygen dissociation curve: A graph that shows the relationship between the partial pressure of oxygen and the saturation of hemoglobin with oxygen.

Common trap

Confusing oxygen transport with carbon dioxide transport: Remember that hemoglobin primarily transports oxygen, while carbon dioxide is transported in plasma and bound to hemoglobin in a different form.

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