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

Phases of viruses, Phases of viruses Viruses have two phases to their ...

Phases of viruses Viruses have two phases to their existence Inside their host cells where they exhibit certain living characteristics. outside their host where they

Causes of air pollution, Causes of Air Pollution We known about the c...

Causes of Air Pollution We known about the composition of atmosphere, its major and minor constituents. The composition of atmosphere has remained the same for thousands of y

Theory of embryology - mosaic thoery, MOSAI C THOERY - It was given by...

MOSAI C THOERY - It was given by W. Roux. He studied the development of frog's egg. He destroyed one cells by a hot needle out of 2-cells formed as a result of first cleava

Enzymatic mutation detection method, This technique utilizes an enzyme reso...

This technique utilizes an enzyme resolvase, endo vii, cloned from the bacteriophage t4. This enzyme has high specificity to find deletions, insertions, and base substitutions muta

How many carbon dioxide molecules liberated in krebs cycle, Q. How many car...

Q. How many carbon dioxide (CO 2 ) molecules are liberated after each cycle of the Krebs cycle? For a single glucose how many carbon dioxide molecules were already liberated by the

Relate osseointegration with biointegration, Osseointegration Vs. Biointegr...

Osseointegration Vs. Biointegration In 1985, dePutter observed that there are two ways of implant anchorage or retention: mechanical and bioactive. Mechanical retention refers

Amoeba, Place a slide of Amoeba (common species is A. proteus) under tlie l...

Place a slide of Amoeba (common species is A. proteus) under tlie lnicroscope and focus it under low power (5x x 5x), and observe it carefully. Amoeba looks like an irregular colou

Lymph, Why lymph is also called middle man of body

Why lymph is also called middle man of body

Nutrition of embryo sac, Nutrition of Embryo Sac The morphology of th...

Nutrition of Embryo Sac The morphology of the ovule suggests that the chalazal end is the main route for the entry of nutrients. The funicular vascular supply ends at the bas

Accessory food substances or vitamins, Q. Accessory Food Substances or Vita...

Q. Accessory Food Substances or Vitamins ? Bacteria also vary in their need for vitamins or accessory growth factors. Some microorganisms are unable to synthesize some or all o

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