To allow the air to enter the body. The air can enter through either the nose or through the mouth.
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Respiratory
Air sacs are part of the respiratory system
The lungs are part of the respiratory system. The respiratory system is involved in the intake and exchange of oxygen and carbon dioxide between an organism and the environment.
Respiratory System
the respiratory system
The respiratory system is the organ system that moves air into and out of your body.
Air can be taken into the respiratory system at the mouth and the nose.
The respiratory system supplies the body with oxygen and expels carbon dioxide.
Mucus in the nose helps trap particles entering the respiratory system. The hairs/cilia of the respiratory system also filter incoming air.
The diaphragm is the organ of the respiratory system that doesn't touch air.
The respiratory system. The alveoli are air sacs in the lungs.
In the sense that it is a delivery system between the oxygen intake system (respiratory) and the body, and also between the nutritional intake system (digestive) and the body.