Question

mechanism of hormone action ???​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

Mechanism of Hormone action

Hormones effects target cells by binding to hormone receptors (specific proteins). Each hormkme bindsto it's specific proteins. Hormones receptors present in the target cells are of 2 types :

1. Membrane bound receptors present on cell membrane of target cells.
2. Intracellular receptors present inside the target cells, mostly nuclear receptors.

Binding with the receptors, it forms : Hormone receptor complex. The Hormone receptor complex further leads to certain changes in the target cells. And hence the hormones regulate the functions.

The hormones are of 4 types based on chemical nature :

1. Peptide, Polypeptide, Protein Hormones : Insulin, Glucagon, Pituitary Hormone, Hypothalamic Hormone
2. Steroids : Cortisol, Testosterone, Estradiol, Progesterone
3. Iodthyronines : Thyroid Hormone
4. Amino acid derivatives : Epinephrine

Hormones that bind with membrane bound receptors do not enter the cell, but helps in generating second messengera like cyclic AMP, Ca++ and IP3 which regulates cellular metabolism.

Hormones (Steroid hormones and Iodthyronines, etc.) which bind with intracellular receptors, regulate the gene expression and chromosome function by interacting with the genome.