BIO2242 – LECTURE 11
All animals produce waste products that must be removed from the body:
The process shown in the diagram is:
Diffusion = solute on one side, and they move to the other side due to
It is the controlled movement of solutes.
Hypotonic solution = net water movement will move into the RBC and will burst.
Isotonic solution = net water movement is the same
Hypertonic solution = net water movement go leave the RBC and they will shrink
Animals osmoconform or osmoregulate:
Shore crab = osmoregulator
Spider crab = osmoconformer
Water balance and waste disposal:
They have to balance water loss to water gain.
Some animals are able to extract water from air = water vapor from air
Compared with a marine invertebrate, the body fluids of a freshwater
About the same
Exactly the same
Get amino acids from ingested proteins or cellular proteins.
Ammonia is toxic and soluble.
Urea is less toxic than ammonia.
Uric acid is even less toxic but not very soluble
Life in the sea:
Fish are on the constant risk of drying out
Marine fish diagram:
It is constantly getting water and salt in, which they need to get rid of. They do
this by the gills (main exchange). In the