Exam 4 Study Guide

Exam 4 Study Guide - Exam 4 Study Guide Osmoregulation and...

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Exam 4 Study Guide Osmoregulation and Excretion (Ch. 44) 1. Water flows by osmosis from a HYPOOSMOTIC solution to a HYPEROSMOTIC one. Hyperosmotic: greater concentration of solutes i. Freshwater Bony Fish Hypoosmotic: more dilute i. Marine Bony Fish 2. Osmoconformers Only MARINE animals Isoosmotic with surroundings No tendency to gain or lose water i. Because internal osmolarity is the same as that of its environment Live in water that has a very stable composition Constant internal osmolarity Can tolerate changes of osmolarity in estuaries (where freshwater meets salt water) If an animal lives in an area where osmolarity is constant, they keep their osmolarity of body fluids within narrow limits, but they don’t regulate it. 3. Osmoregulators Many marine animals ALL FRESHWATER AND TERRESTRIAL ANIMALS Must control internal osmolarity i. Body fluids are not isoosmotic with environment. Discharges water if in HYPOOSMOTIC environment Takes in water if in HYPEROSMOTIC environment
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Must expend energy to maintain the osmotic gradients that cause water to move in or out. i.
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This note was uploaded on 06/01/2008 for the course BISC 220L taught by Professor Herrera,mcclure during the Spring '07 term at USC.

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Exam 4 Study Guide - Exam 4 Study Guide Osmoregulation and...

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