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!
Threshold Value of Different Larval Tissues
Threshold value of dissimilar larval tissues for the thyroid hormone concentration
One of the main problems of metamorphosis is the co-ordination of developmental events. The tail should not degenerate till some another means of locomotion, namely the limbs develop, and the gills should not regress till the animal can employ its newly developed lung muscles. Kollros (1961) illustrated the possibility of this coordination that displays that different larval tissues have diverse threshold value for thyroxine. In other words the different larval tissues are sensitive to dissimilar concentrations of thyroid hormone.
This model is termed as the threshold concept. It has been observed that structures in the tadpole that change early during metamorphosis are more sensitive to and have low threshold value to thyroxine, than those which go through transformation at a later stage. As metamorphosis commences the thyroid hormone level slowly builds up and different events occur at different concentrations of the hormone. Experimental studies have revealed that tadpole pans that have a low threshold respond earlier during metamorphoses than those parts comprising a high threshold response. In other words, the threshold value reflects the order where metamorphic changes occur in normal development. In urodeles the bulging of eyes reacts to the weakest dose of thyroid hormone (minimum threshold) and thus is the first event in metamorphosis. This is followed by reduction of fin fold and the shortening and disappearance of external gills. After which takes place the closure of gill clefts and transformation of skin.
Q Coming from the acid pH of the stomach which pH level does the chyme find when it enters the duodenum? Why is it necessary to maintain that pH level in the small intestine? What
project formate for monocot and dicot plants in feild per month
Q. Explain the Technique of Balloon Mitral Valvuloplasty? The procedure is performed by cannulation of the right femoral vein and the procedure is similar upto transseptal punc
1.sarcomastigophora 2.sporozoa 3.cnidospora 4.ciliophora
e use itwhat is difference between peroxisme and lysosome what is function of it and where w
Please help with the following: Using the letters S for ribose sugar and B for the nitrogeneus base, draw a diagram that shows the arrangement of these components into (a) a sin
VENOU S SYSTEM It is collecting system formed by the uniting branches as smaller and then larger veins and venacava leading to the heart. Blood from anterior part of the
Respiratory System in Living Organisms Respiration is a necessary physiological process in all living organisms by which they obtain energy for carrying out all the metabolic
How Rb protein's phosphorylation state affects the cell cycle and cancer progression. please put link or citation of where you find information.
Define Fluids required for underweight - nutritional care? Take fluids only after a meal instead of with or before meals so that food intake is not reduced. High calorie nouris
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