Biology 3601A/B Lecture 6: Lecture 6
2 Nov 2018
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Lecture 6 turtles salt glands & eating jellyfish. Nacl: na and cl are essential to physiological function, na and cl need to be carefully managed in conjunction with water balance, drive action and membrane protentional, drive water balance. If maintaining an iso-osmotic system, then low u:p ratio in secretion is ok. Sharks do this: don"t need high powered kidneys, may use active salt secretion methods, many species are hypo-osmotic, their blood osmotic pressure is lower than the osmotic pressure of the sea, pretty much all marine vertebrates do this. Sharks & rays: gills & rectal salt gland. Sea snakes: jaw/sublingual salt gland: crocodiles: tongue (lingual glands) Leatherback turtles - dermochelys coriacea: note: not a good krogh model, not convenient to study leather back turtles, hatchling (44 g) adult (300-500 kg) in in 12-29 years, mainly eat jellyfish. Salt gland secretions: marine turtles can drink the salt, because they can excrete the salt through these salt glands.
