Organism Physiology Paper
DeAndrea Wheeler
July 31, 2013
BIO/101
Hildegrade Selig
Kingdom: Animalia, Phylum: Chordatra, Superclass: Tetrapoda, Class: Reptilia, Subclass: Diapsida, Order: Squamata, Suborder: Lacertilia. Family: Agamidae, Genus: Chlamydosaurus. Lizards are widespread groups with more than 4000 species ranging across all continents expect Antarctica, as well as most oceanic island chains. This paper will cover Characteristics of a lizard, the ancestry to the modern lizard, the circulatory and respiratory system and what aspirations the lizard has gone through to be the survivor it is today. [good introduction!]ü
Characteristics
Lizards are cold blooded reptiles. They cannot make their own body heat so they spend the majority of their time in the sun staying warm. Most lizards have jaws with teeth they also have teeth on the roof of their mouth. Lizards have dry, scaly skin. They have four legs, …show more content…
The trachea divides into two bronchi which open into the lungs without bronchioles. The lungs are simple hollow sacs with internal folds lines with alveoli for an increased surface area.in more advance lizards the lungs are further divided. Respiration which is voluntary and dependent, blood carbon dioxide pressure and temperature is aided by expansion and contraction of the ribs as lizards lack a diaphragm. In many lizards gas exchange occurs in the cranial part of the lung. While the caudal portion of the lung is correspondent to the avian air sac. Some lizards can revert to the absence of free oxygen, during prolonged periods of apnea. The glottis is usually closed expect during inspiration and expiration. The glottis is generally quiet and rostral and located at the base of the