lologopro5479 lologopro5479
  • 21-06-2018
  • Biology
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"runner's high" occurs when prolonged, intense athletic activity causes the release of _____, the brain's natural painkiller.

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lilfir3fight3rp8krgu lilfir3fight3rp8krgu
  • 21-06-2018
The brain releases endorphins as a natural pain killer.
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