Question 1
Which statement describes the circulatory system?
- A pump and valves only
- Blood vessels, a pump and valves that ensure one-way flow of blood
- Blood vessels and a pump that allow blood to flow in both directions
- A pump that moves blood and air
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Answer: B (1) Vessels, pump and valves for one-way flow
Question 2
(a) Name the pump of the circulatory system. [1] (b) State the job of valves in the circulatory system. [1]
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- heart (1)
- stop blood flowing backwards / ensure one-way flow of blood (1)