Action of hormones, Biology

Action of Hormones

We said earlier that hormones are released into the blood stream or extracellular fluid and therefore, reach most of the cells of the body. However, they are specific and influence only their destined target cells. Other cells do not react. For instance, insulin passes throughout the body but only the liver and muscle cells respond to it by taking up glucose. Similarly the target cells respond to the hormones differently are different times. Injections of thyroxine will not make a very young tadpole develop into an adult since the cells cannot respond to the hormones as they will in later life. This suggests that only specific receptor molecules at the target cells recognise and bind to particular hormones, and other cell do not possess these receptor molecules. When the hormone reaches a target cell many changes may occur in the cell.

  1. The activities of various enzymes may increase or decrease inactive enzymes are activated.
  2. Permeability of plasma membranes may be altered.
  3. Increase in activity of certain genes may alter the types of messenger RNA and proteins produced by the target cells.

 

Posted Date: 1/17/2013 1:14:35 AM | Location : United States







Related Discussions:- Action of hormones, Assignment Help, Ask Question on Action of hormones, Get Answer, Expert's Help, Action of hormones Discussions

Write discussion on Action of hormones
Your posts are moderated
Related Questions
What are the nutritional components of the foods we consume? The foods that we consume are composed of varying quantities of the following nutritionally important components:

#phyletic lineage ..

Q. Show the Collection of Primary Samples of grain? Sampling of grains begins with the collection of the primary sample i.e. sample of the consignment. The process involved in

Vulvovaginal candidiasis  Vulvovaginal candidiasis is not sexually transmitted, but is often found incidentally in women with STIs. Many remedies are available for vulvovaginal

What is Double Labelled Water (DLW)? Technique DLW is currently considered the most accurate technique for measuring TEE in free- living individuals. It is the method used to m

Which of the following is TRUE about the properties of aqueous solutions? Select one: a. A pH change from 5.0 to 6.0 reflects an increase in the hydroxide ion concentration (

a) List the a variety of modes of heterotrophic nutrition in plants. b) Define any two modes giving one example of each.

Q What is metabolism? Metabolism is the set of chemical and physical processes upon which the life of the cells of a living being depends.

Chopping/grinding These are the processes by which the particle size of cereals, oil cakes and roughages including green fodders and crop residues is reduced employing various

Meningococcal disease  Meningococcal vaccine is recommended for adults and children >2 years old who are traveling to areas where epidemics are occurring, or to the "meningitis