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Chemical Coordination and Integration

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Discuss somatotrophic or growth hormone. State the abnormalities cause due to hyposecretion or hypersecretion of growth hormone?

Somatotrophic or growth hormone : It stimulates growth and development of tissues by increased rate of cell division and protein synthesis. It is released by the anterior lobe of the pituitary or the pars digitalis region.

Abnormalities due to growth hormone :

1. Dwarfism : If GH is secreted in less amount ( hyposecretion), it may cause dwarfism.

2. Gigantism : When growth hormone is secreted in excess it brings abnormality in height. The person grows into a giant with long bones.

3. Acromegaly : If in adults it is secreted in more quantity then it brings enlargement of fingers, chin, toes, arms ,the proportion of the body and the limbs is disrupted. This condition is referred to as acromegaly.


Name the endocrine gland which is H shaped.

Thyroid gland.

What is goitre?

Goitre is the condition in the the thyroid gland is enlarged and the neck portion becomes swollen .It is due to the deficiency of iodine in our diet which results in the less production and secretion of the thyroid hormones that is hypothyroidism.

Name the cells that the thyroid gland is composed of.

The thyroid gland is composed of the following :
i. Follicles
ii. Stromal tissue

Why is the Parathyroid hormone called hypercalcemic hormone?

PTH or parathyroid hormone is also called hypercalcemic hormone as it increase the calcium level in the blood.

Name the largest endocrine gland.

Thyroid gland.