Sagot :
Answer:
1. Adrenaline levels rise, which stimulates the heart to beat faster.
2. Capillaries in the muscles open wider, increasing blood flow there by up to 20 times.
And some more
- The muscles of the ribcage assist the diaphragm to pull in up to 15 times more oxygen than at rest.
- Breathing gets faster but also deeper.
Explanation:
Pa brainliest po.