Question

Draw a sectional view of the human heart and label on it the

following parts:

i) Aorta

ii) Pulmonary arteries

iii) Vena cava from upper body

iv) Left ventricle

b) why is double circulation of blood necessary in human beings?

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Answer 1

Answer:

HEYA MATE,

Explanation:

SORRY I CANT DRAW THE DIAGRAM BUT DOUBLE CIRCULATION OCCURS SO THAT OXYGENATED AND DEOXYGENATED BLOOD COULD BE DIFFERENTIATED AS BLOOD FLOWS TWICE IN OUR BODY AT TIME AND VERY IMPORTANT POINT THAT THIS HELPS US MAINTAIN CONSTANT TEMPRETURE AS WELL AS IN BIRDS TOO.

MARKAS BRAINLIEST@!!!!!!!!!!