Class Notes (835,674)
Canada (509,327)
BIOB34H3 (271)
Lecture

OSMOREGULATION 1.docx

11 Pages
111 Views
Unlock Document

Department
Biological Sciences
Course
BIOB34H3
Professor
Jason Brown
Semester
Summer

Description
SLIDE 2osmoregulation is about regulating various aspects of the body fluids of animalsThe animal is separated from its external environment The external environment refers to either freshwater marine or terrestrial These are the 3 major types of environment animal physiologists usually talk aboutThe animal is separated from the external environment by the integument The integument is the boundary between the environment and the animal so for animals this would be the skinInside the animal are several body fluids The most important body fluid is probably the intracellular fluid the fluid thats found within the cells The ICF is where all metabolic reactions in the take place in the intracellular fluids so the amount and composition of the fluid is important because if it changes too much it might have disastrous effects on the enzymes that are carrying out the metabolic reactionsEverything is geared towards assuring that the ICF is well regulated to make metabolism efficientWhat could affect the composition of ICFoOne thing is water moving either into the cell from ECF or water from the ICF moving out to the ECF If you have net movement of water into or out of the cell it might concentrate or dilute the contents of the fluids in the cell therefore effect ions and solute therefore have a negative effect on the proteins in that cell The ICF is separated from two kinds of extracellular fluid One is the blood plasma the other is the interstitial fluid and this fluid is directly surrounding the cellThe blood plasma is separated from the cell by 2 boundaries one is the plasma membrane which closes the ICF and the other is the endothelium The endothelium is a layer of cells and a single layer of cells at some points that separates the blood plasma from the interstitial fluidIn animals with closed circulatory systems another major fluid is the lymph The lymph is as close to the interstitial fluid you can getYou have fluid coming from the blood plasma crossing the endothelium to get into the interstitial fluid space the lymph is simply the interstitial fluid as its returning to the bloodWhen you think of the lymphatic system and you think of lymph the fluid thats come out of the blood plasma to surround the cell which is now called the interstitial fluid the lymph the interstitial fluid thats getting into the lymphatic system and going back to the blood plasma There isnt a complete separation between interstitial fluid and blood plasma because that interstitial fluid is taken back to the blood plasma and comes back so a fluid circulation is going onSLIDE 3If you dont have a closed circulatory system you dont have blood plasma because you dont have a distinction between the blood plasma and other extracellular fluids you only have one kind of extracellular fluid which is named haemolymphThe haemolymph is akin to the blood and the lymph and the interstitial fluid in an animal with an open circulatory systemRegardless of the circulatory system in osmoregulation you want to regulate various aspects of these body fluids The 3 aspects we try to regulate are osmotic pressure ionic composition and volumeWhen you talk about osmoregulation you talk about how do animals regulate these 3 components of their body fluidYou talk about how they regulate osmotic pressure which is the total concentration of solutes dissolved and fluid Ionic composition can be how animals regulate sodium potassium calcium ions and how they regulate volume example keeping the volume of the cell constant and causing it to not burstSLIDE 4Osmotic pressure regulation refers to how animals regulate how much concentration of solute in total is present in their body fluidsYou can demonstrate osmotic pressure by taking a U shaped tube and divide it in the middle by a semipermeable membrane which is permeable to water but not the solutes dissolved in waterThe left side has just water the right side is a solution which could be salt water You fill them up in equal amounts and let it sit for a whileWater will move from the left side to the right side to try to balance the concentration of sodium chloride on both sidesThe osmotic pressure was higher on the right side because of the presence of solutes Water moves from low osmotic pressure to high osmotic pressureYou can see that you still have water on the left side and solutes on the right side of the tube and there still isnt equal concentration on both sides This is because another kind of pressure opposes osmotic pressure which is called hydrostatic pressure As water
More Less

Related notes for BIOB34H3

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit