Which of the labelled parts in the given diagram contract together?

A and B

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B and D

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C and D

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A and C

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Solution

The correct options are
A
A and B

C
C and D

The chambers of the heart are as follows:
A: right atrium
B: left atrium
C: right ventricle
D: left ventricle

When the atria relax, they fill up with blood. Once full, both the right and the left atria contract together and pump the blood to the ventricles on their respective sides. Then the ventricles contract and pump blood to the respective blood vessels associated with them.

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