Mammals are said to have a "double circulator | vedclass

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(C) In mammals, the blood flows through the heart twice during each complete cycle of circulation through the body. This process involves two distinct

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That there are two systems; one from the heart to the lungs and back to the heart and other to and from the rest of the body

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(C) In mammals, the blood flows through the heart twice during each complete cycle of circulation through the body. This process involves two distinct circuits: $1$. Pulmonary circulation: Blood travels from the heart to the lungs for oxygenation and returns to the heart. $2$. Systemic circulation: Oxygenated blood is pumped from the heart to the rest of the body tissues and deoxygenated blood returns to the heart. Therefore, the correct description is that there are two systems: one from the heart to the lungs and back to the heart, and the other to and from the rest of the body.

Mammals are said to have a "double circulatory system". This means

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