Give the characteristics of Epithelial tissue
The characteristics of Epithelial tissue are as follows
- Epithelial tissue is found on inner and outer body surface.
- Epithelial tissue lines the hollow organs, body cavities, blood vessels and ducts.
- Epithelial tissue originates from all the three primary germ layers i.e., ectoderm, endoderm and mesoderm.
- Cells of an epithelial tissue are compactly arranged and thus, a very little or no intercellular space is seen.
- Cells are placed on thin, doubled layered, non-cellular basement membrane.
- Epithelial tissue has nerve supply of its own.
- This tissue is avascular (a =without, vascular – vessel) i.e. it lacks its own blood supply and hence, obtains mutrients which diffuse out of blood vessels.
- Epithelial tissue has the power of division and regeneration. The old injured dead cells are sloughed off regularly.
- The main function of tissue is protection secretion, absorption, diffusion etc.
Q.2 How Epithelium is characterised Explain it.
- i) The presence of many cells which are closely arranged and bound with less amount of intercellular substance.
- ii) It is devoid of blood capillaries and consequently it is nourished by lymph.
- iii The cells are mostly arranged on a thin sheet of delicate and non-cellular membrane called basement membrane.
Q.3 Give the functions of Epithelium tissues.
Answer : The functions of the epithelial tissue are –
- i) Mainly protection.
- ii) Reception of stimuli
- iii) Absorption and
- iv) Secretion.