Blood circulation in a mammal is said to be double because

Assessment: JAMB UTME - Biology - 2018 Subject: Biology

Question 1 Report

Blood circulation in a mammal is said to be double because
Answer Details
The majority of mammals (including humans) utilize a double circulatory system. This means we have two loops in our body in which blood circulates. One is oxygenated, meaning oxygen rich, and the other is deoxygenated, which means it has little to no oxygen, but a lot of carbon dioxide.
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