2.68b Osmoregulation

Understand how the kidney carries out its roles of excretion and of osmoregulation 

1. (process) osmoregulation
Osmo = Osmosis
Regulation = to control

2. The tissue fluid which surrounds these cells must be ISOTONIC with the cytoplams of these cells (= the amount of water going into + out must be equal and the cells remain theier function + shape)

3. Blood circulating into the tissue = Hypertonic (conc) - add too much water to the cells
or
 Hypnotic (dilute) - remove too much water from the cells

4. ISOTONIC conditions is achieved by controlling the composition of blood
- blood forms the tissue fluid
- kidney controls the composition of blood
- excess water + salts are removed