Blood circulation in a mammal is said to be dou... - JAMB Biology 2021 Question
Blood circulation in a mammal is said to be double because?
A
it passes twice through the heart in a complete circuit
B
it moves in both arteries and veins
C
it circulates in both the heart and other organs
D
the heart contains auricles and ventricles
correct option: a
It is called a double circulatory system because blood passes through the heart twice per circuit.
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