Question 1 Medium
Which part of blood carries urea to the kidneys?
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Answer: plasma
- Dissolved wastes are in the liquid.
- It is plasma.
Blood: GCSE Combined Science Biology practice questions
A second set of questions on blood. They are different from the ones on the topic page. Try each, then open the answer and compare your working.
More questions
Question 2 Medium
What shape are red blood cells?
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Answer: biconcave
- They are dented on both sides.
- They are biconcave discs.
Question 3 Medium
In which organ does haemoglobin join with oxygen?
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Answer: lungs
- Oxygen enters the blood in the lungs.
- Haemoglobin joins with it there.
Question 4 Medium
What forms at a wound when platelets help the blood to clot?
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Answer: scab
- The clot dries out.
- It forms a scab.
Question 5 Hard
Why do red blood cells have no nucleus? Give the word that describes the space left.
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Answer: more room for haemoglobin
- The nucleus is not needed.
- This gives more room for haemoglobin.
Question 6 Hard
Name the chemicals made by white blood cells that neutralise toxins.
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Answer: antitoxins
- Pathogens can release poisons.
- Antitoxins neutralise them.
Question 7 Hard
Which blood component has no nucleus and is only a cell fragment?
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Answer: platelets
- It helps clotting.
- It is a platelet.
Question 8 Hard
Name the compound formed when haemoglobin joins with oxygen.
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Answer: oxyhaemoglobin
- This happens in the lungs.
- It is oxyhaemoglobin.
Quick checks
Short questions with options. Choose one before you open the answer.
Check 1
What are the four parts of blood?
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Plasma, red blood cells, white blood cells and platelets.
Check 2
What is plasma?
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The pale yellow liquid part of blood that transports substances.
Check 3
Name three things carried by plasma.
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Carbon dioxide, urea and digested food (also hormones and heat).
Check 4
What is the job of red blood cells?
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To carry oxygen from the lungs to the body cells.
Check 5
What is haemoglobin?
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The red protein in red blood cells that joins with oxygen.
Check 6
What is formed when haemoglobin joins with oxygen?
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Oxyhaemoglobin.
Check 7
Why do red blood cells have no nucleus?
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To leave more room for haemoglobin.
Check 8
Why is a red blood cell a biconcave disc?
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It gives a large surface area for absorbing oxygen.
Check 9
What is a phagocyte?
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A white blood cell that engulfs and digests pathogens.
Check 10
What is a lymphocyte?
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A white blood cell that makes antibodies.
Check 11
What are antitoxins?
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Chemicals made by white blood cells that neutralise toxins from pathogens.
Check 12
What are platelets?
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Small fragments of cells that help the blood to clot.
Check 13
What does a blood clot do?
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It forms a scab that stops bleeding and keeps pathogens out.
Check 14
Which blood component carries urea from the liver to the kidneys?
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Plasma.
Check 15
Do white blood cells have a nucleus?
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Yes.
Check 16
What is a pathogen?
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A microorganism that causes disease.
Check 17
What does blood carry from the gut to the body cells?
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Digested food, such as glucose, in the plasma.
Check 18
Where does haemoglobin pick up oxygen?
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In the lungs.
Check 19
What happens to oxygen in the body tissues?
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It is released from the haemoglobin and passes into the cells.
Check 20
What does biconcave mean?
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Dented in on both sides, like a disc with a dip on each face.
Check 21
How can red blood cells fit through narrow capillaries?
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They are small and flexible.
Check 22
How do phagocytes destroy pathogens?
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They engulf them and then digest them.
Check 23
What do antibodies do?
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They destroy one particular kind of pathogen.
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