2.68b - osmoregulation

- osmoregulation - to control osmosis
- the cells in the body are surrounded by tissue - this is isotonic and means the same amount of fluid is passing through all cells and are maintaining their shape
- if the blood going into the tissue is highly concentrated then its hypertonic or vey dilute hypotonic tissue fluid
- this would cause either too much or too little fluid going into the tissue
- we want to keep it isotonic
- the kidneys controls the composition of the blood
- the kidneys remove excess water and salts, these are then excreted so it does not get into our blood stream