2.68b Osmoregulation

Notes


"Role of kidney in process of excretion an osmoregulation"

Osmo = 'osmosis'
Regulation = 'to control'

Cells in body
-> Tissue fluid (surrounding cells) = MUST be ISOTONIC with cytoplasm of cells
------> Water (In to cells) = Water (Out of cells) ---> Cells same size/shape, functions properly

**Danger to tissue (cells) by circulated blood**
-> Hypertonic = concentrated blood --> Remove too much water
-> Hypotonic = dilute blood --> Add too much water

ISOTONIC = Achieved by controlling composition of blood (forms tissue fluid) -> Role of kidneys

Blood circulates through kidney (in excess) are removed & excreted:
-> Salts = hypertonic
-> H2O = hypotonic


Excreted to control blood to be isotonic with cells cytoplasm -> maintains functions of cell & tissue