State the purpose of respiration.

The purpose of respiration is to supply the body with oxygen and eliminate carbon dioxide. Oxygen is essential for cellular respiration as cells cannot exist in the absence of it. The human lungs are the organs responsible for respiration.

Explanation:

Respiration refers to a person’s breathing and the movement of air into and out of the lungs. The respiratory system provides oxygen to body tissues for cellular respiration, removes the waste product carbon dioxide, and helps maintain acid–base balance. Inspiration is the process that causes air to enter the lungs, and expiration is the process that causes air to leave the lungs . A respiratory cycle (or one breath while you are measuring respiratory rate) is one sequence of inspiration and expiration.

your picture is not part of the scientific method.