Respiratory System

EVERY LIVING CELL IN THE BODY needs a constant supply of oxygen to survive. Cells must also dispose of their primary waste product, carbon dioxide. The role of the respiratory…

Sinuses

Several air-filled cavities, known as sinuses, are situated in the skull bones around the nose and the eyes. The size and shape of these sinuses vary between individuals. Sinuses are…

Breathing and Respiration

Air constantly enters and leaves the lungs, enabling the tissues of the body to receive an adequate supply of oxygen and to dispose of their waste product, carbon dioxide. Breathing…