VAN 211: Veterinary Histology and Embryology (2+2)

RESPIRATORY SYSTEM

• This system serves mainly for intake of oxygen and elimination of carbon dioxide.
• It may be divided into conducting and respiratory portions.
• The former are air-conducting tubes which connect external air with that portion of lungs where exchange of gases takes place.
• The tubes are hollow and comprise nose, pharynx, larynx, trachea, bronchi of various size.
• The branch divides within the lung to smaller and smaller branches, the smallest division finally ending in alveoli, where exactly the exchange of gases takes place.