What do you mean by platyhelminthes, Biology

Assignment Help:

Q. Compared to platyhelminthes which physiological problems have the cylindrical body of nematodes brought? How was that problem solved?

The cylindrical shape of nematodes made impossible the respiration exclusively by simple diffusion among cells since there are tissues far from the external. This problem was solved by the presence of an internal cavity in the body filled with fluid, the pseudocoelom.

The pseudocoelom has the function of distributing nutrients and gases to the body and to collect residuals, besides serving as a hydrostatic base to keep the worm shape. For the fact that the pseudocoelom and the pseudocoelom fluid do not characterize a true circulatory system with blood and heart it is not said that in nematodes the respiration is cutaneous it is considered that these animals still make respiration by diffusion.


Related Discussions:- What do you mean by platyhelminthes

What is pinocytosis, Pinocytosis: - The  ingestion of dissolved materials  ...

Pinocytosis: - The  ingestion of dissolved materials  by  endocytosis.  The cytoplasmic membrane invaginates and pinches off placing small  droplets of fluid  in  a  pinocytic vesi

Why is the occurrence of eyelids in amphibians, Why is the occurrence of ey...

Why is the occurrence of eyelids in amphibians in comparison to their absence in fishes and adaptation to terrestrial life? Eyelids associated to lacrimal glands protect and ke

State in brief about the term - calcium and magnesium, State in brief about...

State in brief about the term - Calcium and Magnesium  Exchangeable forms of these ions are considered to be available nutrients. The concentration from extractant is found by

Define subphylum chelicerata, Define Subphylum Chelicerata - classes Arachi...

Define Subphylum Chelicerata - classes Arachinda AM merostomata? The subphylum Chelicerata includes familiar horse shoe crab, spiders, scorpions, ticks and mites. 1. Body consis

#titleclasses of fish.., what are the two main classes into which fish are ...

what are the two main classes into which fish are divided

Tolerance range, organism that have wide tolerance range

organism that have wide tolerance range

Haversian canals and the volkmann canals of the bones, Q. What are the Have...

Q. What are the Haversian canals and the Volkmann's canals of the bones? Is the osseous tissue vascularized? The Haversian canals are longitudinal canals present in the osseous

taxonomy and evolution, explain industrial melanism and genetic repatterni...

explain industrial melanism and genetic repatterning during isolation with example

What are the constituent elements of the blood, What are the constituent el...

What are the constituent elements of the blood? The blood is made of a liquid and a cellular part. The fluid part is known as plasma and in it there are several substances, suc

Etiologic factor of dyslipidemia, Q. Etiologic factor of dyslipidemia? ...

Q. Etiologic factor of dyslipidemia? The causative factors of dyslipidemia/hyperlipidemia may be environmental (dietary/ lifestyle), genetic or secondary to certain disease con

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd