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Animal Tissue

Defining Tissue

Defining tissue, theory of animal tissue and types of tissue, get zoology assignment help, animal tissue homework help, animal tissue writing projects assistance and biology problems solutions from live experts. In origin originated from all three layers of embryonic developmental stage. In a restricted sense tissue forming cells generally have common origin.

Aggregation in definite layers or group of cells having definitely similar structure and function is called tissue. Cells or tissue mayor may not be similar. In origin originated from all three layers of embryonic developmental stage. In a restricted sense tissue forming cells generally have common origin.

GENERAL FEATURES

1. Cells are adhered together by a non-living intercellular substance which is generally secreted by themselves.

2. This substance is tough and jelly like.

3. Collagen fibres provide tensile strength.

4. Ground substance found in this space is called tissue fluid.

5. Each tissue is having a profuse network of nerves; blood capillaries and lymphatics.

6. There is continuous exchange of blood plasma and tissue fluid between blood capillaries and cells of the tissue.

7. This exchange facilitates cellular respiration and exchange of metabolites between these two.

8. Tissue fluid acts as a medium for this process.

Historical background: Anatomical studies are as old as christ itself. Herophilus is considered as the father of anatomy The word "tissue" was coined by Bichat.

Marcello Malpighii in 17th century founded a separate branch of anatomy and named it microscopic anatomy Later in 19th century Mayer coined the name histology

Rules for the nomenclature of histological studies are contained in a draft called "Nomina Histologica" published by International Anatomical Nomenclature Committee (IANC).

TYPES OF TISSUE

In a triploblastic animal tissues develop from all the three basic layers viz. ectoderm, mesoderm and endoderm. Tissues are classified in four basic categories:

1. Epithelial,

2. Connective

3. Muscular

4. Nervous.