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Vertebrate Zoology
Anamniotes to Amniotes
Question | Answer |
---|---|
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 |