AQA · Biology · 8461
GCSE Biology: Blood
Organisation · AQA GCSE Biology (8461), specification point 4.2.2.3. Cards are generated from the exam board's own specification for "Blood", and every card links back to the page it came from. Specification © AQA — used with attribution.
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What type of body structure is blood classified as?
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A tissue.
What is the liquid component of blood called?
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Plasma.
Name the three types of component suspended in blood plasma.
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Red blood cells, white blood cells and platelets.
What is the main function of red blood cells?
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To transport oxygen from the lungs to the body's cells (bound to haemoglobin).
What is the main function of white blood cells?
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To defend the body against pathogens (part of the immune system).
What is the function of platelets in blood?
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They help the blood to clot at a wound.
What is the main function of blood plasma?
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To transport dissolved substances (e.g. glucose, carbon dioxide, urea, hormones) and the blood cells around the body.
Why do red blood cells have no nucleus?
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To leave more room for haemoglobin, so each cell can carry more oxygen.
How does the biconcave shape of a red blood cell aid its function?
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It gives a large surface area to volume ratio, so oxygen diffuses in and out quickly.
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