Ch#14 |Transportation | Lec #15 | TRANSPORTATION IN ANIMALS (Transportation In Hydra) @riffatjahan

TRANSPORTATION IN ANIMALS:
Transportation in Unicellular Animals:
Unicellular animals have maximum surface area volume ration.
Most of the substances move into or out their bodies by simple diffusion, osmosis, active transport, and facilitated diffusion.
So there are no special transport systems involved, same is true of simple multicellular animals which are aquatic.
Transportation in Multicellular Animals:
But complex multicellular animals possess well organized, and developed transport system in the form of blood vascular system.
Transportation In Hydra:
Hydra is an aquatic diploblastic coelenterate.
It is fresh water in habitat.
The body of hydra is composed of two layers.
The outer layer is ectoderm where as the inner endoderm.
In between the ectoderm and endoderm is mesoglea, which is non, cellular.
Mechanism of Transport:
The outer surfaces of the ectoderm cells are exposed to the
water in which the animal lives.
Water, containing oxygen and food is taken into the coelenteron by the movement of tentacles, and flagella, which are present in most endoderm.
The materials and food may be absorbed or taken up by endocytosis by endodermal cells.
The indigestible and partly digested food is removed by
exocytosis from these cells into digestive cavity coeleoteron.
Ectodermal cells get food from endodermal cells by diffusion.
The ectoderm cells directly exchange respiratory gases with the surrounding water, The ectodermal cell gets their nutrients from endodermal cells.
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