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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Define endocrine system and discuss the types of endocrine glands.

Endocrine system : It consists of endocrine glands that secrete hormones directly into the circulatory system to be carried towards distant target organs.

Types of endocrine glands :

1. Pure endocrine glands : These glands only secrete hormones e.g. thyroid gland, pituitary gland etc.

2. Heterocrine glands : These glands secrete both enzymes and hormones. Thus, they act as endocrine and exocrine e.g. pancreas.

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Name the cells that the thyroid gland is composed of.

The thyroid gland is composed of the following :
i. Follicles
ii. Stromal tissue
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Name the endocrine gland which is H shaped.

Thyroid gland.
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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.
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Name the largest endocrine gland.

Thyroid gland.
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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.
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