Tissue is divided/Classified into four groups according to its structure and function. The tissue is a cluster of cells, these cells work similarly, and their nature and structure are the same. The tissue is the structure between cells and organs. All types of body tissue are 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 –
Epithelial tissue or epithelium is arranged as a continuous sheet. Less space between two cells, this tissue is an avascular tissue, but nerve supply is present in the epithelial tissue, and it’s divided into two types. (A) Covering & Lining Epithelial Tissue (B) Glandular Epithelial Tissue
(A) Covering & Lining Epithelial Tissue –
This type of tissue covering of skin & body cavities also lines the ducts. it again divided into two types –
I. Simple Epithelium
II. Stratified Epithelium (Multiple Layers)
I. Simple Epithelium –
It is made up of single-layer cells, a type of simple epithelium Based on the 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 protects the underlying structure from wearing and tearing.
(a) Stratified Squamous Epithelium – There are two types of stratified squamous epithelium.
⇒ Keratinized stratified squamous epithelium. Lining dry surface of the body like – Skin, Hair, Nail.
⇒ Non-Keratinized stratified squamous epithelium. Lining wet surface of the body like – mouth, Anal canal, Vagina, Conjunctiva of eyes.
(b) Stratified Cuboidal Epithelium. Lining on Part of male urethra Ducts of the sweat gland.
(c) Stratified Columnar Epithelium. Some line part of the urethra, Small area in the anal mucus membrane.
(d) Transitional Epithelium. Line in urinary bladder, ureter & Part of the 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 the body. Function – ProvideSupport Strength and connect other tissue, Protect & insulate internal organs, Transportation, storage, the main site of immune reaction.
It consists of two basic elements
I. Cell II. Matrix
I. Cell –
few connective tissue cells are
- Fibroblast cells
- Adipose cells or Fat cell or Adipocytes
- Mast cells
- Macrophages
- Plasma cells
- WBC
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 types of fiber found in the matrix
- Collagen fibers
- Elastic fibers
- Reticular Fibers
Classification of connective tissue
(a) Lose Connective tissue
- Areolar Connective tissue
- Adipose connective tissue
- Reticular connective tissue
(b) Dense connective tissue
- The dense Regular connective tissue
- Dense irregular connective tissue
- Elastic connective tissue
(c) Cartilage connective tissue
- Hyaline cartilage connective tissue
- Fibrocartilage connective tissue
- Elastic cartilage connective tissue
(d) Bone
(e) Blood
(f) Lymph
3. Muscle Tissue –
Muscle tissue is made up of elongated cells called muscle fiber. In this tissue heaving contraction & relaxation property then muscle tissue provides body movement. Types of muscle tissue – Based on location, structure & function is classified into three categories –
(a) Skeleton muscle tissue
(b) Smooth muscles
(c) Cardiac muscles tissue
Also Read –
Surgical instrument pictures, name, and their uses
The Pregnancy changes in Mother & Baby Body
Head Injury/Brain Injury Causes & Classification
Body Cavity – Definition and Structure
ONLINE TEST SERIES FOR AIIMS RISHIKESH EXAM
