ani phys lecture 11-1

ani phys lecture 11-1 - Exam 3 notes Animal phys November...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Exam 3 notes Animal phys November 1, 2007 Will not be on exam 2 Osmoconformers vs. osmoregulators Animal body Transepithelial diffusion, ingestion, defecation, metabolic water production obligatory Active epithelial transport controlled Page 30 on notes – table taken from old version of Eckert Positive and negatives of this comparison in different environments Salt water Fresh water No water Osmoconformers Fluids in body match environment Fresh water animals will resemble salt concentration in their water environment Osmoregulators Maintain. Salt concentrations in cells and tissues remains the same wherever they may be. Exceptions: Crayfish Semi-osmo (pick one) In low salt concentration they maintain a constant level but when [na+] goes up so does theirs The table is for humans Despite fact that concentrations of some of these ions may be different, overall it maintains the same First line is concentrations of salts in sea water. About a 1000 milioswalts…a lot of chloride Jelly fish Star fish annelida All three are osmoconformers Amount of salt in their tissue mimics that of the salt water they’re in Advantage of osmoconformer Don’t need a kidney Decrease ATP use Just a little too much urea Nitrogenous waste Don’t have to worry about too little water or salt no diffusion/osmosis problems Mollusks also conformers Fresh water has very little salt They conformed to fresh water
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Don’t have to worry about salt entering or water leaving because it matches the environment Disadvantages for conformers: Limited for which environments they can be in Can’t take fresh water and put into salt water environment Why aren’t vertebrates that live in the seas osmoregulators Why have vertebrates decided to go the osmoregulatory salt (a lot of extra energy needed to make that kidney go). What is the advantage of being a regulator? Need lots of sodium… sodium outside, calcium inside to make brain go. conformers have weak CNS Cephalopods Squid, octopi conformers Have really good brain, nervous system, they keep the salts out…the rest of the body is a conformer Evolutionary power of evolution Look at the top row (dog fish and shark) Look at [sodium and chloride]…. Is dog fish a regulator? Yes, but if you look at its osmolarity it’s about 1000. regulates salt balance but doesn’t regulator it’s water balance because it’s the same as the environment Look at far right, the urea levels utilizes it by pumping it back in That’s a lot of urea Good test question It acts as a neuro regulator but a osmoconformer for water We got salt water, fresh water, and terrestrial SW flounder Inflow = salt (diffusion is high to low) What will they lose? water Have a damn good kidney Water retention Tend to have salt glands = outflow (to get rid of salt) In the gills has pumps that removes Na and Cl Requires ATP to pump against the gradient Other animals use salt glands like a sea bird…it removes salt by various glands crocodile tears (fake
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/15/2008 for the course BIOL 482 taught by Professor Cohen during the Fall '07 term at CSU Northridge.

Page1 / 19

ani phys lecture 11-1 - Exam 3 notes Animal phys November...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online