Name the four components of blood.
Reveal answer
Plasma, red blood cells, white blood cells, platelets.
Key words: plasma · platelets
3(h) TRANSPORT · RECALL
3.9 Composition of the blood
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Which blood component is a cell fragment?
Reveal answer
Platelets.
Key words: platelets
Where are blood cells made?
Reveal answer
In the bone marrow.
Key words: bone marrow
What does a low red blood cell count cause?
Reveal answer
Fewer red cells → less oxygen carried → less aerobic respiration → tiredness.
Key words: oxygen
What is meant by the term plasma?
Reveal answer
Liquid component of blood.
Key words: plasma
What is meant by the term red blood cell?
Reveal answer
Haemoglobin-containing cell specialised for oxygen transport.
Key words: red blood cell
What is meant by the term white blood cell?
Reveal answer
Immune cell involved in defence.
Key words: white blood cell
What is meant by the term platelet?
Reveal answer
Cell fragment involved in clotting.
Key words: platelet
Blood components: for Plasma, give the structure and the main role.
Reveal answer
Structure: Watery liquid. Main role: Transports cells, solutes and heat.
Key words: Plasma
Blood components: for Red blood cell, give the structure and the main role.
Reveal answer
Structure: Biconcave, haemoglobin-rich cell. Main role: Oxygen transport.
Key words: Red blood cell
Blood components: for White blood cell, give the structure and the main role.
Reveal answer
Structure: Nucleated immune cell. Main role: Defence against pathogens.
Key words: White blood cell
Blood components: for Platelet, give the structure and the main role.
Reveal answer
Structure: Small cell fragment. Main role: Blood clotting.
Key words: Platelet
True or false, and why? “Plasma is just water.”
Reveal answer
False. It contains proteins, ions and many transported substances.
True or false, and why? “All white blood cells make antibodies.”
Reveal answer
False. Lymphocytes can produce antibodies; phagocytes have a different role.
True or false, and why? “Platelets are complete cells.”
Reveal answer
False. They are small cell fragments.