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

Hibernation and aestivation, Normal 0 false false false ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Assignment of botany, habitat, habit, cell wall chemistry, reason why cell ...

habitat, habit, cell wall chemistry, reason why cell wall like this of Archaebacteria , eubacteria,fungi,algae,bryophytes ,pteridophyes, gymnosperms , angiosperms..

Explain the criteria for assessment of vitamin status, Explain the Criteria...

Explain the Criteria for Assessment of Vitamin Status? Vitamin E is assessed by determining the plasma lipid fraction levels. 0.8 mg of total tocopherol/g total plasma lipids i

What is linkage, What is linkage? Two genes are assumed to be under lin...

What is linkage? Two genes are assumed to be under linkage, or linked, when they reside in the same chromosome. For instance, the research of the human genome discovered tha

Amphibians - regeneration in vertebrates, Amphibians - Regeneration in Vert...

Amphibians - Regeneration in Vertebrates Newts and salamander show remarkable regenerative ability in larval as well as adult stages. In larval stages except for limbs and tai

Enzymology, Ethylene glycol is a poison that causes about fifty deaths a ye...

Ethylene glycol is a poison that causes about fifty deaths a year in the United States. Treating people who have drunk ethylene glycol with massive doses of ethanol can save their

Echinoderms, Phylogenetic considerations

Phylogenetic considerations

What is the neuromuscular synapse, Q. What is the neuromuscular synapse? ...

Q. What is the neuromuscular synapse? Neuromuscular synapse is the structure through which the neural impulse passes from the axon of a motor neuron to the muscle cell. This st

Dissociative (conversion) disorders, DISSOCIATIVE  (CONVERSION) DISORDERS: ...

DISSOCIATIVE  (CONVERSION) DISORDERS: There is normally a considerable degree of conscious control over the memories and sensations that can be selected for immediate attentio

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