Page "Amphibian" Paragraph 27
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In the adult state they have tear ducts and movable eyelids and most species have ears that can detect airborne or ground vibrations.
Their skin contains little keratin and lacks scales, apart from a few fish-like scales in certain caecilians.
On contraction, these alternately pass the blood to a single ventricle which pumps it both into both the systemic vessels ( which service the body at large ) as well as the pulmonic vessels ( which return to the lungs for oxygenation ).
Most amphibians lay their eggs in water and have aquatic larvae that undergo metamorphosis to become terrestrial adults.
Amphibians breathe by means of a pump action in which air is first drawn into the buccopharyngeal region through the nostrils.
These are then closed with valves and the air is forced into the lungs by contraction of the throat.
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