The regulatory system given to this particular question would be Homeostasis. homeostasis means that it creates a balance between things that are interdependent upon each other.
Answer:
For adult, compress the chest to a depth of at least 2 inches. For a child, compress to a depth of about 2 inches. For an infant compress to a depth of 1 ½ inches.
Explanation:
They have to take course.
