What is gland?? What is Endocrine and Exocrine gland?? Function and Classification of Endocrine and Exocrine gland.

Gland

Gland is an aggregation of glandular epithelium cells that produce secretion or excretion.

Classification of gland

A. According to number of cells: 

 • Unicellular (e.g. goblet cells).

 • Multicellular (e.g. salivary glands).

B. According to presence or absence of duct: 

1.Exocrine gland: Which secret their products into a surface by ducts, e.g. salivary gland, exocrine

pancreas etc.

2. Endocrine gland: Which secret their products into blood without duct, e.g. pituitary gland, thyroid gland.

3. Mixed gland: When both endocrine and exocrine functions are present, e.g. pancreas.

C. According to the nature of secretion:

1. Mucous, e.g. palatine glands.

2. Serous, e.g. parotid gland, pancreas.

3. Mixed, e.g. sublingual, submandibular glands.

D. According to the development:

1. Ectodermal, e.g. parotid gland, mammary gland, glands of skin.

2. Mesodermal, e.g. kidney, gonad etc. 

3. Endodermal, e.g. thyroid, liver, pancreas etc

Endocrine Gland

Definition of endocrine gland:

Endocrine gland are the ductless gland which directly secretes their products into the blood. Example: pituitary gland, thyroid gland, adrenal gland etc.

Name the endocrine glands in human body:

1. Hypothalamus.

Pituitary gland

2. Pituitary gland (master gland):

a) Anterior pituitary gland.

b) Posterior pituitary gland.

3. Thyroid gland.

4. Parathyroid gland.

5. Adrenal gland:

a) Adrenal cortex.

b) Adrenal medulla.

6. Pancreas.

7. Testes.

8. Ovary.

9. Placenta.

How do work Endocrine gland in human body 

Functions of endocrine glands:

 1. Endocrine gland helps metabolism.

2. It helps in growth and development.

3. It helps in reproduction.

4. It helps in behavior.

5. It regulates water and electrolyte balance.