Question

nature of harmones ??​

Answer 1

Answer:

Hryyy Dear......

Here is Your Answer

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Chemical Nature of hormones

Chemically hormones may be steroids, proteins, peptides or amino acid derives.

1. Steroid hormones : The hormones secreted by the testes, adrenal cortex, placenta and ovaries are composed of steroids. E.g. , testosterone, corticosterone, aldosterone, oestrogen and progesterone.

2. Proteinaceous hormones : Hormones secreted by anterior lobe of the pituitary gland and hormones secreted by the pancreas are composed of proteins.

3. Peptide hormones : Peptide hormone includes:

• The hormones secreted by the intermediate lobe of the pituitary gland. Eg. MSH
• The hormones secreted by posterior lobe of pituitary gland. E.g., vasopressin, ADH and oxytocin.
• The hormones secreted by the anterior lobe of pituitary gland. E.g., ACTH.
• The hormones secreted by the parathyroid gland. E.g., parathormone.
• The hormones secreted by the thyroid gland. E.g., calcitonin.

4. Amino acid derivative hormones : Amino acid derivative hormones include:

• The hormones secreted by the thyroid gland. E.g., thyroxine.
• The hormones secreted by the adrenal medulla. E.g., adrenaline and nonadrenaline.

Hope you Got it....

Answer 2

Answer:

➡️ the molecules of most of the harmone are small.

➡️ molecular weight is low.

➡️ hormones are soluble in water and are easily diffusible in tissues.

➡️ hormone is secreted in very small quantity.

➡️ hormones are destroyed after use ( exception is Thyroxine ).

➡️ liver and kidneys separate them from blood and decompose them.

➡️ hormones don't participate in the metabolic activities of target cells but they affect and control the activity level of these target cells.