Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Origin of Regeneration Cells of Blastema
The origin of the cells making the blastema in vertebrates has been investigated by various workers in the case of regenerating legs of salamanders and newts. Their studies have depicted that cells which form the blastema are of local rather than of systemic origin. To come to this conclusion they have performed various irradiation experiments on urodeles. It has been observed that appropriate dose of x-rays supress the capability of urodeles to regenerate.
Figure: Histological sections of regenerating newt limbs
By using this knowledge scientist found that those urodeles whose bodies were irradiated failed to regenerate their limbs after amputation. Similarly, irradiated limbs also failed to regenerate upon consequent amputation. Though if the limb was shielded from the x-rays while the rest of the body was irradiated then regeneration proceeded normally in the limb while the limb was amputated. If only a portion of limb for example the knee joint was irradiated, after that regeneration of the limb took place only if the amputation was done above or below the irradiated segment and not through it. Figure displays some of the irradiation experiments performed on the urodeles. These experiments clearly depicted the local origin of the cells of the blastema.
Mosaic and Regulative Eggs Eggs as well as early cleavage embryos are occasionally divided into two categories: i) Mosaic or determinate embryos and ii) Regulative or i
Guanotelism - Excretion Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
Define Physiological effects on the GIT of prebiotics? Since prebiotics are fermented by the gut microflora, they may have physiological effects on the GIT such as: Cont
Explain about the Multiple Sclerosis This is a disease characterised by the loss of myelin, largely in motor tracts but also in sensory tracts. The loss of myelin is not unifor
Pollination Pollination refers to the transfer of pollen from dehiscing anthers to the pistil. Unlike animals, plants cannot move to their mates for sexual reproduction. Henc
Q. Show the Use of Incineration for sterilization? This is an excellent method for rapidly destroying materials such as soiled dressings, animal carcasses, bedding and patholog
Explain the structure of Intermediate Filaments? Intermediate filaments , about 8 to 10 nm in diameter, are so named because they are intermediate in size between microfilamen
What benefits led to natural selection of a two-circuit pump function of the heart a) One circuit to go from the heart to the body and one from the heart to the lungs b) One cir
Q. What are the major negative ions found in living beings? The main anions found in living beings are the chlorine anion (Cl - ), the sulphate anion (SO - ), the nitrate ani
What is the disease caused by vitamin D deficiency? Which tissue does it affect? The lack of vitamin D causes the disease called as rickets (rachitis), characterized by decalci
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd