L20A
44.1 Osmoregulation balances the uptake and loss of water amd solutes
44.2 An animal's nitrogenous wastes reflect its phylogeny and habitat
44.3 Diverse excretory systems are variations on a tubular theme
44.4 The nephron is organized for stepwise processing of blood filtrate
44.5 Hormonal circuits link kidney function , water balance, and blood pressure