Anatomy of the Respiratory System . Function . Brings oxygenated air in to the body for delivery to the blood cells. Expels waste products that have been returned to the lungs by the blood . Upper and lower respiratory tract . The nose, mouth, pharynx, epiglottis, larynx, and the trachea
To make the bones of the skull lighter
Help produce sound by giving resonance to the voice
To produce mucus that drains into the nasal cavity
As air is taken into the alveoli it immediately passes into the surrounding capillaries and is carried by the erythrocytes to all the body.
At the same time, the waste product carbon dioxide passes from the capillaries into the airspaces of the lungs to be exhaled.