What causes the pre-selected volume of air to flow into the patient by communicating directly with a breathing circuit?

What causes the pre-selected volume of air to flow into the patient by communicating directly with a breathing circuit? Correct Answer Bellows

The bellows are like pumps that send in the air to the patient. They hold a certain volume of air and gives it to the patient at a certain pressure. They work like a normal pump, they suck air from the supply tank in a proportionate ratio and allow it to mix. Then, they force the air out from a tube and it is received by the patient.
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