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2 votes
Which is released into the blood stream during exercise?

A.Insulin

B.Endorphin

C.Serotonin

D.Melatonin

2 Answers

6 votes

Answer: B. Endorphin

Explanation: Endorphins are released into the bloodstream during exercise that reduce the feeling of pain.

User Sergio Figueiredo
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5 votes

Answer: b endorphin

Step-by-step explanation:

User DrCord
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