The diagram shows a human capillary.
State and explain one feature of capillaries visible in the diagram that helps them to carry out their function.
Capillaries form part of the circulatory system of some organisms.
Explain why multicellular organisms, such as humans, require a circulatory system while single-celled organisms, such as bacteria, do not.
The circulatory system is an example of a mass transport system.
Define the term mass transport system.
(1)
Describe how the lungs and circulatory system work together to allow efficient mass transport in the body.
(3)
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