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Respiration in Non-Homeotherms - Anatomy & Physiology (view source)
Revision as of 10:33, 15 August 2008
, 10:33, 15 August 2008→Lizards
===Lizards===
===Lizards===
*No diaphragm
*No diaphragm
*Simple, saclike, paired lungs
*Cranial part of lung is site of respiratory function
*Caudal part of lung forms air ''reservoir''
*Ventilation occurs via expansion and contraction of the ribs
===Snake===
*Larynx projects medially from the floor of the mouth and is fused with the first few cartilage rings of the trachea. This forms a rigid '''Glottis'''.
*Tongue is fixed at the rostral point of the oral cavity.
*Generally only the right lung is present. The lung of snakes is very fragile.
*Inspiration is an active process, made possible by expansion of the ribs. It occurs approx once every 30seconds in large, healthy snakes. Expiration is a passive prcoess.
===Chelonians===
*Have paired lungs in the '''Dorsal Cavity'''. Intestines etc lie in the '''Ventral Cavity'''. These are separated by a diaphragmatic septum which has no muscular part.
*Lungs are ventilated by leg movement in terrestrial animals.