Water Balance 9.4

Block 5

If an animal cell is in a hypoosmotic solution…

Water will end the cell unit it swells or bursts

If surrounded by a hyperesomotic solution…

Water leaves the cells and shrink

Osmotic Pressure

Pressure required to prevent osmosis through a semipermeable membrane between a solution and pure solvent

Goal of homeostasis

Internal environment and extracellular fluid is isosmotic (osmoregulation)

Main organs include:

Kidneys and bladder

Changes in Osmotic blood pressure signal hormones to…

Increase reabsorption of water and conserve body water

Water Balance

Water intake goes up which equals urine output to go up

Water intake goes down or exercise goes up, urine output goes down

ADH (Antidiuretic Hormone)

Conserve bnody water by reducing the loss of water in urineA

Diuretic

Agent that increases that rate of urine formation

Antidiuresis

Decreased formation of urine

Blood solutes become concentraded

Equals to high blood osmotic pressure

Too much solutes in blood can cause

To conserve water and reabsorb (prevents urine output)

Regulated with antidiuretic hormone (ADH)

Increases water reabsorption in kidney (increases permeability of the distal tubule and collecting ducts) allowing more water to filtrate

It is produced where?

In the hypothalamus (thirst center)