BIOL 2030 Lecture Notes - Lecture 17: Yolk Sac, Permian, Thoracic Cavity
20 Mar 2017
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Introduction: earliest known reptile early permian (~300 mya, million years ago, highest diversity during mesozoic era, nonavian reptile members includes ~9500 species, over 300 species in north america, reptilian orders. Ventilation: negative pressure breathing, draws air into lungs by expanding thoracic cavity, amniote lungs have high surface area and are well developed, supplemental respiration, sea snakes skin, aquatic turtles pharynx and cloaca. Jaws allow for mechanical chewing: some reptiles have modified jaw to allow swallowing of preys larger than the head, their limbs have better body support than amphibians. Circulatory system: frogs 3 chambered heart. March 20, 2017: left atrium and right atrium mixing of blood therefore no saturated blood that your heart needs, turtles 3 chambered (septated heart) Incomplete separation by septa: mixing of blood but more efficient than amphibians, birds and mammals 4 chambered heart. Some lizards and crocodiles vocalize to establish territory: ja(cid:272)o(cid:271)son"s organ highly developed sense of smell.
