Kangaroos

opposums

The Stability of the internal enviorment

or 

the stability of the extra cellular comparment

WHat are two fluid compartments?

what is an important characterisctic of them?

The extracellular fluid = Plasma + interstitial fluid

The intracellular fluid

The ecf and the icf remain fairly constant, but are NOT equal in solutes

They are both seperated by a membrane

The body will try to compensate.

If itsucceedsyou are well.

If it fails you are ill or sick

The law of mass balance

In order to maintain a constant amount of something ( water) 

The the amount entering the body has to equal the amount leaving the body.

Through secretion!

organs that help are the liver and the kidneys.

Whatsis a mebolite?

How fast the substance leaves the body?

Think of...

Everyboyd clear the room!!!

everyone gets out fast.

Clearance is given by volume of plasma cleared of a substance per time

ml of water/ min

The ECF and IFC are at osmotic equilibruim, meaning the volume remains constant. ONe molecule goes in and one comes out.

Only water moves freely through the membrane

PAthways that cause something to happen....The results than feeds back to the begining of the pathways to control what happens

MOst common, their funtion is to maintian something within normal range.

-maintain temperature and hromones within levels and stablize internal conditions

cause us to move away from normal range

happens during ovulation, delievery, bloodclotting

Membranes are selectively permeable

 Meaning some solutes can crossand others and can't 

There are different amounts of solutes in both sides of member

sodium potassium pump maintains high sodium in ecf and high potassium in icf