what is the mode of action of hormones on membrane bound strucyures

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The correct term is structures.

A hormone is a chemical messenger that regulates physiological processes in living organisms. It is secreted by a gland.

• Hormones exhibit their effects only after binding to their specific receptors located in the target tissues to form hormone-receptor complex. Membrane-bound receptors are present on the cell membrane of the target cell

• This specific reaction leads to biochemical changes in the target tissue, and regulates its metabolism and physiological changes.
  
  
  Mechanism of action of hormones on membrane bound structures

  Hormones interacting with the membrane-bound receptors (insulin, glucagon, pituitary and hypothalamic hormones) do not enter the cells, but generate secondary messengers (e.g., cyclic AMP, IP3). These secondary messengers regulate cellular metabolism.

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