ZOO 2090 Lecture Notes - Lecture 16: Interatrial Septum, Vascular Tissue, Keratin
14 Jun 2018
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Lecture 16!
Respiration & Circulation in
Tetrapods
Kardong Chapters 11-12
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2
External Gills in Amphibians
Typical anuran larvae have external
gills only briefly after hatching. They
are internalized as part of their buccal
pump mechanism used for filter feeding
Salamander larvae and some adults (neoteny)
supplementary
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3
Internal Gill Ventilation in Tadpoles
Internal gills are enclosed by the operculum (skin).
Ventilation involves up and down movement of the buccal
cavity floor moving water into the mouth and out the spiracles
Spiracle
Gills are adjacent to filter plates that trap food particles;
feeding and respiration are accomplished at the same time
supplementary
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Document Summary
External gills in amphibians s u p p l e m e n t a r y. Typical anuran larvae have external gills only brie y after hatching. They are internalized as part of their buccal pump mechanism used for lter feeding. Internal gill ventilation in tadpoles s u p p l e m e n t a r y. Internal gills are enclosed by the operculum (skin). Ventilation involves up and down movement of the buccal cavity oor moving water into the mouth and out the spiracles. Gills are adjacent to lter plates that trap food particles; feeding and respiration are accomplished at the same time. Can increase surface area in different ways papillae increase surface area. Generally: paired, high surface-to-volume ratio, joining the gut by trachea. Trend toward increased compartmentalization associated with increased body size and metabolic rate. Ribs and intercostal muscles power the pump in most reptiles.
