The answer is nares. Breathing describes the process of inhaling and exhaling air. The exchange of gases between living cells and the environment is a process known as respiration, consists of the respiratory. The respiratory system, which controls breathing and respiration, consists of the respiratory tract and the lungs. The nose is the only external part of the respiratory system. It is made of bone and cartilage and is covered with skin. The two openings to the outside, called nostrils, allow air to enter or leave the body during breathing.