Biology 3601A/B Lecture 2: Lecture 2
2 Nov 2018
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Lecture 2 ion and water balance 1. Exam practice q: draw the expected relationship between body mass and mass-specific standard metabolic rate for reptiles. Indicate the expected values of the slope and any transformations of the axis. Log body mass: marine mammal shark, seawater ~1000 mosm, body temp similar to enviro ectotherm, osmolality similar to seawater ~1000 mosm, hypo-nitric and hypo-chloric, osmoconformer. Ionoregulatory: land mammal, 37 degrees body temp, lower osmolality, osmoregulatory. What is moving in and out mammals. In via mouth (food, drinking: absorbed across epithelia (does occur very not much, not very permeable skin) Ions out: kidneys via. urine (mammals, gill epithelia (bony fishes, specific glands (birds and reptiles, water in. In via mouth (+ some absorption: water out, voided/regulated via excretion (kidneys, gills etc. ) Permeability: how much exchange across the outside of the animal with the enviro. Concentrating power of kidneys and glands: the extent to make high concentration of wastes and remove it, water availability.
