Idiom
Which statement regarding the mammalian heart is correct?

When the right atrium contracts, it forces blood into the left atrium
Blood is pumped from the heart via the atria
Oxygen-loaded blood moves only through the right side of the heart
In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs

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Idiom
To cool one's heel

To remain in a comfortable position
To be kept awaiting someone
To rest for sometime
To give no importance to someone

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