Heart pumps oxygen rich blood to the body

Ihave a really high metabolism and only weigh 70 pounds (13 almost 14). people always ask me two questions: do you ever eat and how do you eat so much and stay so skinny. i am worried that a high metabolism wont me forever. what are some safe steps i can take to maintain being fit. (also, i already work out i am a dancer so i get cardio a lot)

Muscles and joints that can move through their full range of motion are more powerful, more coordinated, and less likely to be injured.

Awoman is at the first stage of childbirth. which of these events may be occurring?