BIOL 260 Study Guide - Final Guide: Plasmodesma, Superoxide, Endodermis
Document Summary
Maintain extracellular fluid osmolarity >= than that of seawater (urea and. Tmao keep it this way (need a bit to make it osmalarity high even though low ion level) Sharks ions and water flows in(pees out extra water and salts are [] by salt gland and excreted w/ urine. Producing urea and uric acid needs energy but less water loss b/c concentrated when release. Transfer of fluid from blood into kidney tubule (occurs in glomerulus) called glomerul filtra. Filtration across the glomerulus is a result of a pressure differential between the blood in the glomerular capillaries and the lumen of the bowman"s capsul (hydrostatic pressure gradient and. Regulation of gfr by vascocronricting afferent and efferent arteriole. Processes proximal tube = 65% sodium reabsorbed and 2/3 water reabsorbed. Reabsorbitopn in rest causes decrease in osmolarity which produces dilute filtrate. Collecting duct reabsorbs water so concentrated (adh regulates permeability) Dehydrated so higher adh more h20 absorbed so concentrated.
