A bunch of nerves that are connected to your spine also connect to your brain and sends it the info we need and sends out other information throughout your body
Answer:
The answer is age.
Explanation:
So for a 50-year-old, maximum heart rate is 220 minus 50, or 170 beats per minute.At a 50 percent exertion level, your target would be 50 percent of that maximum, or 85 beats per minute.
Dermis I believe is responsible
