30/1 Comparative Anatomy 10) Osmoregulation (Defination (Osmosis ,…
30/1 Comparative Anatomy
To prevent water loss or gain
from cell the levels of water
in the blood needs to be regulated.
Balance between salt and water
How gain water:
-Drinking, Eating, Respiration
How loss water:
-Sweating, Breathing, Blood loss,
-Urinating, Faeces, Other fluids e.g milk
Lack of water:
If not enough water in body, cells don't work
All metabolic processes produce waste
-solution of lower osmolality,
-Measure of tendency of a solution
to take in water by osmosis.
Key threats to osmoregulation
-Their body be able to the surrounding the pressure under water????
Fresh water animals
-stop water into the their water???
-Reliable water source
Types of animal
-Maintain a relatively constant blood osmolality despite different concentrations in the surrounding environment.
Range of tolereance
Tolerance of salinity
-Adapt to large fluctuations.
-Not much water available. To walk to get water.
Osmoreceptors (thirst cells) in the hypothalaeus monitor the blood passing through the brain (osmoconcentration)
Response to lack of water
-Pituitary gland secretes ADH
-Kidney reabsorbs water (nephron)
Measure salinity of water
A freshwater fish
A marine fish
-Salt glands excrete excess sodium
-Frequently shake head
-Excretory systems that conserve water
-Some have reduced permeability of skin
to conserve water
Do not need fresh water to reprosuce
Dry skin that retards water loss
Excrete uric acid, losing little water in the process