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
Circulatory Assist Devices :  Intra aortic balloon pump (IAUP) was introduced by Kantrowitz (19hX). It is also known as Counter pulsation or Diastolic augmentation.

Thermodynamics and Energy 2 types of energy (kinetic and potential) Work is the transfer of energy from one place to another Energy isn't lost, only converted è fi

A healthy skeletal muscle fiber is isolated and has no external forces on it.  It has normal intracellular levels of ATP and is bathed in physiological saline.  Which of the follow

what compound is phosphorylated for ATP? what is the resulting compound when ATP releases energy


green gland is excretory organ of which ortopodic phylem

Determine the Food Source for Phosphorus? Phosphorus is widely distributed in food. Food phosphorus is a mixture of both organic and inorganic forms although the relative amoun

Explain Surface properties of proteins The surface properties relates primarily to surface tension, a) Emulsification  and b) Foaming characteristics of proteins,

Q. What is mitotic apparatus? Mitotic apparatus is the set of aster fibers, radial structures around each centriole pair, plus the spindle fibers, fibers that extend across the

What is Deuterostome. Explain in brief. Phyla, including the Chordata and Echinodermata which share common characteristics of blastopore-not forming the mouth, radial indetermi