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Vertebrate Zoology

Anamniotes to Amniotes

QuestionAnswer
Ancestral Respiration Interfered with Lateral undulation; Motion would compress one lung and expand another and vice versa so no breathing while walking
Mammalian Respiration Upright posture so that dorsoventral ventilation could occur. So expansion and compression of lungs is in tune with body movements to allow breathing while moving.
Non-Avian Dinosaur Respiration Cuirassial pump includes gastralia as struts to expand the body cavity; Head and tail bob while walking to compress and decompress lungs and drive ventilation
Avian Respiration Lungs- thin capillaries that dont compress/decompress; Airsacs do the pumping linked to wings squeezing and stretching cavity; Allows for constant flow of oxygen rich air in capillaries, and thinner capillaries because of no flexion so higher efficiency
Pre-Avian Dinosaur Respiration Know airsacs existed from the presence of pneumatic bones; Respiration came before flight; Lightweight with more efficient oxygen intake to increase energy of large organisms; Allow for flight, didn't cause flight
Created by: LionsandGiants
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