QS Study

A hormone is a chemical substance that is secreted into the internal body fluid by one cell or group of cells and exerts a physiological control effect on other cells of the body. It affects our body’s functions, from growth and sexual development and mood to how well we sleep, how we manage stress, and how our body breaks down food. It is vital for every movement of life, as well as the processes of digestion, metabolism, growth, reproduction, and mood control.

Physiological Properties of Hormone –

  1. Synthesized or secreted by living endocrine glandular cells,
  2. Transported by blood or other chemical messengers,
  3. Does not provide building material for body function but regulate the growth, differentiation, and metabolic activity,
  4. It belongs to different types of chemical structure,
  5. In the bloodstream, many hormones are stored. Steroid and thyroxin bind to specific plasma carrier protein,
  6. Most hormones have a half-life, e.g., Steroid has a long half-life.
  7. Every hormone has a plasma concentration and changes of a very low level, have a physiological effect.
  8. They are organic catalysts and act as coenzymes of the other enzymes in the body.
  9. Latent period – It is the time interval between secretion and onset of action of a hormone.
  10. Most of the hormones are excreted by the kidney.
  11. It belongs to different types of chemical structure. They may be steroids, proteins, peptides or amino acid derivatives.
  12. Hormonal activity is not related to heredity.