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

Objection of cell theory, OBJECTION OF CELL THEORY (REASONS OF DISCARTION) ...

OBJECTION OF CELL THEORY (REASONS OF DISCARTION) (i)       Living organism are composed of various types of cells and their product but members of monera & protista don't have

The kidney.., where is the inlet and outlet of the diaylsis machine

where is the inlet and outlet of the diaylsis machine

Phylum , General characteristics of phylum

General characteristics of phylum

Which amino acid can form disulfide bonds, a. Which amino acid can form dis...

a. Which amino acid can form disulfide bonds? b. Which level of protein structure do disulfide bonds affect? How? c. Cytoplasmic proteins rarely form disulfide bonds, even if they

Describe amoebae - paramecia and trichomonas, Q How do amoebae, paramecia a...

Q How do amoebae, paramecia and trichomonas respectively move? Amoebae move by amoeboid movements small invaginations and projections of their plasma membrane (pseudopods) that

State the term in detail hydrostatic skeleton., State the term in detail hy...

State the term in detail hydrostatic skeleton. Formed from a fluid-filled and closed cavity surrounded by a body wall comprising muscles oriented in different directions. Muscu

What are the three main parts of a eukaryotic cell, Q. What are the three m...

Q. What are the three main parts of a eukaryotic cell? The eukaryotic cell can be separated into two major portions: the cell membrane that separates the intracellular space fr

Explain glycerol esters of fatty acids, Explain Glycerol esters of fatty ac...

Explain Glycerol esters of fatty acids Glycerol esters of fatty acids, which make up to 99% of the lipids of plant and animal origin have been traditionally called  fats and oi

How is the fluid that fills the nucleus called, The aqueous fluid that fill...

The aqueous fluid that fills the nuclear region is known as karyolymph, or nucleoplasm. In the fluid there are proteins, enzymes and other significant substances for the nuclear me

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