Question

Write a note on classification of hormones based on mode of action.

Answer 1

The pancreatic gland secrete hormone glucagon to control glycogen into glucose.

Answer 2

Chemical Nature:-

(a) Steroid Hormones:

These are made up of lipids, which basically derived from cholesterol, e.g. Testosterone, Estrogen, Proges­terone etc.

b) Amine Hormones:

These hormones are made up of amines. Amine hor­mone is derivative of the amino acid tyrosine.

e.g. T3, T4, epinephrine, norepineph­rine.

(c) Peptide Hormones:

These hormones are made up of few amino acid resi­dues only and present as simple lin­ear chain.

e.g. Oxytocin and vasopressin both consist of only 9-amino acid residues only.

(d) Protein Hormones:

These hormones are also made amino acid residues which are much more in numbers. They represent primary, secondary and tertiary configuration.

e.g. Insulin, glucagon, STH etc.

(e) Glycoprotein Hormones:

These hor­mones are glycoprotein in nature. They are conjugated protein where carbohydrate groups are mannose, galactose, fucose etc.

e.g. LH, FSH, TSH etc.

(f) Eicosanoids Hormones:

The eicosanoids are small fatty acid derivatives with a variety of arachidonic acid.

e.g. Prostaglandins.

Category # 2. On the Basis of Mechanism of Action:

(a) Group I hormones:

These hormones bind to intracellular receptors to form hormone-receptor complexes (HRC), through which their biochemical functions are mediated. These hor­mones are lipophilic in nature and are derivatives of cholesterol (except T3 and T4).

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