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Sidana [21]
4 years ago
13

John Likes hiking he observes that whenever he hikes up a hill he breathe heavier than when he is on flat ground which two state

ments explain why this happened
Biology
2 answers:
Nataly [62]4 years ago
5 0
Because when he hikes up a hill he does much more effort than when he walks in flat ground, also the heart beats faster in order to send blood to all his organism
Anton [14]4 years ago
3 0

Answer:

Sensors in the brain detect a lack of oxygen.

The muscles in his body need more energy and therefore more oxygen

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