ZOO 2090 Lecture Notes - Lecture 16: Hebat, Lungless Salamander, Internal Carotid Artery

• School: University of Guelph
• Department: Zoology
• Course: ZOO 2090
• Professor: Fred Laberge

Document Summary

Objectives contrast lung ventilation in tetrapods describe specialized integument required for skin breathing highlight the major differences in tetrapod circulatory systems. Important points different respiratory mechanisms available to amphibians and circulatory system modifications that go along with them the requirements of skin breathing the mechanisms of lung ventilation in tetrapods the mechanisms of embryo respiration in amniotes. Typical exam question: which sequence of blood flow through the mammalian heart is correct: right ventricle -> lung -> left atrium -> left ventricle -> systemic circulation -> right atrium. Respiration -> gas exchange exchange surface between environment and respiratory organs transport of gases in blood exchange surface between capillaries and tissues. External gills in amphibians gills smaller in mountain stream salamanders because water is colder (more dissolved oxygen) Tadpole respiration typical anuran larvae (tadpole) have external gills briefly after hatching internalized as part of their buccal pump mechanism used for filter feeding.