What part of the heart receives oxygen rich blood from the lungs and squeezes it into the right ventricle?

This is the part of the heart on the left side of the heart that receives oxygen-rich blood from the pulmonary vein that is responsible for then moving the blood into the left ventricle. It is relaxed with blood and contracted without any blood present.

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explanation:

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hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds