Answer: Ambulatory monitoring of the electrocardiogram in 100 healthy 14 to 16 year old boys showed heart rates ranging from 45 to 200 beats/minute during the day and from 23 to 95 beats/minute during sleep.
Answer:
a sedentary lifestyle can lead to an increase in heart failure
Explanation:
Brain stem :) It controls all the things like breathing, heartbeat, body temp, blood pressure and alertness ^_^