BISC 101 Lecture Notes - Lecture 11: Euryhaline, Body Fluid, Alpha Cell

• School: Simon Fraser University
• Department: Biological Sciences
• Course: BISC 101
• Professor: Onkar Bains

Document Summary

^wastes of the digestive tractfeces . stored i(cid:374) the rectum. ^another major function is the reabsorption of mineral ions. ^this triggers cells lining the wall of duode(cid:374)u(cid:373) cholecystokinin (cck) and secretin: ^the gallbladder to contract so that bile. The liver is the primary site for glucose homeostasis: ^a carbohydrate-rich meal raises insulin levels, ^low blood sugar causes glucagon to stimulate, ^in pancreas, beta cells produce insulin while alpha cells produce glucagon. Wherever solutes move, water tends to fall. Osmoregulation balances the uptake and loss of water and solutes. ^os(cid:373)osis o(cid:272)(cid:272)urs (cid:449)he(cid:374) t(cid:449)o solutio(cid:374)s . osmolarity: ^u(cid:374)it of (cid:373)easure(cid:373)e(cid:374)t of os(cid:373)olarity . 10-3, ^the osmolarity in human blood is about 3000 mosm/l 1000 mosm/l. ^if two solutions differ in osmolarity the net flow of water is from hypo-osmotic to the hyper- osmotic solution. ^left side=higher solute concentration, lower free water concentration. ^right side=lower solute concentration, higher free water concentration. ^body fluid of marine bony fishes are hypo-osmotic to the external sea water.