The diagram shows a section through the heart.
The ventricles contract and blood is forced into the arteries.
What is the state of valves 1 and 2 when this happens?
1 )
valve 1: closed / valve 2: closed
2 )
valve 1: closed / valve 2: open
valve 1: open / valve 2: closed
4 )
valve 1: open / valve 2: open
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