Tissue is divided/Classify in four groups according its structure and function. The tissue is a cluster of cells, these cells are work similarly, and its nature and structure are same. The tissue is structure between cell and organ. All types of body tissue developed by three primary germ layers (Ectoderm, Mesoderm And Endoderm).
1. Epithelial Tissue
2. Connective Tissue
3. Muscle Tissue
4. Nervous tissue
TYPES OF TISSUE
1. Epithelial Tissue –
(A) Covering & Lining Epithelial Tissue –
This type of tissue covering of skin & body cavities also lining the ducts. it again divided into two types –
I. Simple Epithelium
II. Stratified Epithelium (Multiple Layers)
I. Simple Epithelium –
It made up single layer cells, type of simple epithelium Based on shape of cells.
(a) Squamous Epithelium or pavement epithelium – Function – Filtration, Diffusion, Osmosis.
(b) Cuboidal epithelium – Function – Secretion, Absorption, Excretion.
(c) Simple Columnar epithelium – Function – Secretion, Absorption.
(d) Ciliated Columnar – Function – Give movement to mucus & other substance by ciliary action.
II. Stratified Epithelium (Multiple Layers)-
This layer is protect underlying structure for wearing and tearing.
(a) Stratified Squamous Epithelium – There are two types of stratified squamous epithelium.
⇒ Keratinized stratified squamous epithelium. Lining dry surface of body like – Skin, Hair, Nail.
⇒ Non Keratinized stratified squamous epithelium. Lining wet surface of body like – Mouth, Anal canal, Vagina, Conjunctiva of eyes.
(b) Stratified Cuboidal Epithelium. Lining on Part of male urethra Ducts of sweet gland.
(c) Stratified Columnar Epithelium. Some line part of urethra, Small area in anal mucus membrane.
(d) Transitional Epithelium. Line in urinary bladder, ureter & Part of urethra.
(B) Glandular Epithelial Tissue –
This type of tissue produce secretion, situated in glands made by goblet cells these cells specialize to produce chemicals. glandular epithelial tissue is multi functional epithelial tissue.
2. Connective Tissue –
This type of tissue is the largest amount in body. Function – Provide Support Strength and connect other tissue, Protect & insulate internal organ, Transportation, storage, main siteof immune reaction.
It consist of two basic elements
I. Cell II. Matrix
I. Cell –
few connective tissue cell are
- Fibroblast cells
- Adipose cells or Fat cell or Adipocytes
- Mast cells
- Plasma cells
II. Matrix –
Space Between the cells filed by matrix, matrix made by fibrous and ground substance (The material between cells and fiber called ground substance Ex. H2O, Hyaluronic acids.
Fibers – There are three type of fiber found in matrix
- Collagen fibers
- Elastic fibers
- Reticular Fibers
Classification of connective tissue
(a) Loose Connective tissue
➤ Adipose connective tissue
➤ Reticular connective tissue
(b) Dense connective tissue
➤ Dense irregular connective tissue
➤ Elastic connective tissue