Assertion: tiger salamander's gill | /r/Desires | the changing of pressures
Facets:
value: to ensure diffusion of oxygen
type: PURPOSE
value: typically
type: DEGREE
Source sentences:
text: Unlike amphibians with internalized gills which typically rely on the changing of pressures within the buccal and pharyngeal cavities to ensure diffusion of oxygen onto the gill curtain, neotenic salamanders such as Necturus use specified musculature, such as the levatores arcuum, to move external gills to keep the respiratory surfaces constantly in contact with new oxygenated water.