Question

Radha noticed while running that the heart
beat is increased. She asked the reason of
this from her friend and she told har that
this happened due to A) shrimking of veins while running B) deficiency of nutrients in blood C) slow speed of blood flow D) body needs more oxygen while doing exercise​

Answer 1

Explanation:

i n s t a. I. d

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Answer 2

d) Our body needs more oxygen while doing exercise.