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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
What hormones are secreted by the posterior pituitary gland ? What function does each serve ? Where are these hormones actually produced ? 

The posterior pituitary gland or neurohypophysis or pars nervosa stores and release two hormones :

1. Vasopressin (ADH or Antidiuretic Hormone)

2. Oxytocin

1. Function of Vasopressin hormone. Vasopressin hormone controls urine output. When there is more water in the body then this hormone is secreted in less amount. When amount of water is less inside the body then it is secreted in more amount so the urine output is less. The ADH hormone reduces water loss. 

2. Function of Oxytocin :

(i) It acts on smooth muscles and results in their contraction .

(ii) It stimulates rigorous contraction in the uterine walls during the child birth.

(iii) It stimules ejection of milk from the mammary glands. 



Name the endocrine gland which is H shaped.

Thyroid gland.

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.

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

Name the largest endocrine gland.

Thyroid gland.