Glands are the groups of cells which are specialised in structure and function. They produce chemical substances required for the body for various metabolic activities. These glands are of two types: A. Endocrine and B. Exocrine. A. Endocrine Glands: There are secretory glands found in various parts of the body which have no ducts of their own. Their secretions called [...]
In this article we will discuss about the endocrine glands in vertebrates with the help of a suitable diagram. Elasmobranchii: Elasmobranchs have most of the vertebrate endocrine glands. They are thyroid pituitary, adrenal tissue, pancreas, mucous membrane of stomach and duodenum, and gonads. There are no thymus and parathyroids as such. The functions of pituitary glands are not known except [...]
The following diagram (Fig 49.1) shows the approximate position of the important endocrine glands in the body of a man and woman. The chief endocrine glands of vertebrates are: 1. Thyroid, 2. Parathyroid, 3. Adrenal, 4. Pituitary, 5. Thymus, 6. Pineal, 7. Pancreas, 8. Mucous membrane, and 9. Gonads. 1. Thyroid Gland: Development: Thyroid gland arises in an embryo as [...]