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 allele frequency, What is allele frequency? The Allele frequenc...

What is allele frequency? The Allele frequency is the percentage of appearances of an allele in the genotypes of a given population (compared to the other alleles of the studie

Internal factor - factor controlling metamorphosis in insect, Internal Fact...

Internal Factor - Factors Controlling Metamorphosis in Insects Likewise to the amphibian metamorphosis, moulting and metamorphosis in insects has been found to be initiated in

What is insulin pump, Insulin Pump An  insulin pump is a device used fo...

Insulin Pump An  insulin pump is a device used for the administration of  insulin, also known as continuous subcutaneous insulin infusion therapy. The device includes: - the

Define proteolytic enzymes, Proteolytic enzymes They catalyze the hydro...

Proteolytic enzymes They catalyze the hydrolysis of peptide bonds in other proteins. In order to prevent them doing generalized damage to all cellular proteins, they are often

Determine the mechanical properties of ti and ti alloy, Mechanical Properti...

Mechanical Properties of Ti and Ti Alloy as Compared to Bone  Titanium tends to seize when in sliding contact with itself or other metal. Titanium based alloys have a high co-e

Indications for surgery- pulmonary stenosis, Indications for Surgery :  Co...

Indications for Surgery :  Congenital pulmonic stenosis is the most common lesion requiring relief. Very rarely it could be due to rheumatic involvement along with disease of othe

Define the luminal membranes, A healthy person is on a diet that consists o...

A healthy person is on a diet that consists of very small amounts of water. A. This person will have high water permeability across the luminal membranes of the medullary colle

A patient was complaining of frequent urination, A patient was complaining ...

A patient was complaining of frequent urination, excessive thirst and dehydration. His fasting glucose level was found to be normal. Name the disease and its cause. Describe

Define obligatory and facultative water excretion, Define Obligatory and Fa...

Define Obligatory and Facultative water excretion? i) Obligatory water excretion: The kidney is 'obligated' to excrete some water to rid the body of its daily load of urinary s

What are plasmids, What are plasmids? What is the importance of plasmids fo...

What are plasmids? What is the importance of plasmids for the recombinant DNA technology? Plasmids are circular fragments of DNA that are accessories to the major bacterial DNA

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