Animal tissue | Types of Tissues |Their Definition|
Content
1:- Epithelial Tissue & It's types
2:- Connective Tissue & It's types
3:- Muscular Tissue & It's types
4:- Nervous Tissue & It's types
Animal Tissue
Animal tissue consist of four basic types of tissues which differ in location, structure and function as mentioned below.
1:- Epithelial Tissue
2:- Connective Tissue
3:- Muscular Tissue
4:- Nervous Tissue
These tissue are organized in a specific manner to form different types of organs.
1:- Epithelial Tissue
Epithelial Tissue provided a covering or lining for various internal and external body parts. The cells are compactly arranged with little intercellular spaces. According to the number of cell layers,
Epithelial Tissue is divided into two types:
a- Simple Epithelial
• Composed of single layer of cells.
• Forms lining of body cavities,ducts & tubes
b- Composed or Stratified Epithelial
• consist of two or more cell layers.
• Has protective function.
according to the shape, Epithelial tissue can be divided into 4 types.
A- Squamous Epithelial
• It consists of flat cells
• It is found in blood vessels, skin, etc.
B- Cuboid Epithelial
• it consists of two cube-shaped cells and is found in lining parts of the body, such as kidney tubules and the walls of respiratory bronchioles.
C- Columnar Epithelial
• it consists of tall pillar-like cells.
• It consists of lining of stomach and intestine.
D- Ciliated Epithelial
• If the columnar or cuboidal cells bear cilia on their free surface, they are called ciliated epithelial.
• Cilia (hair-like projections) move back forth to move particles out of our body.
• It is found in respiratory tract.
2:- Connective Tissue
connective tissues are most abundant and function in linking, connecting or supporting other tissues or organ in the body. The cells in connective tissues are loosely packed and are embedded in an intercellular matrix.
Connective is categorised into different parts.
A:- Areolar Tissue
• It is present beneath the skin, around blood vessels, nerves, etc.
• It acts as a packaging or supporting Tissue and fills space inside the organs.
B- Adipose Tissue
• It is found beneath the skin between internal organs
• The excess nutrients in the body are converted into fats and are stored in this tissue.
• The cells of this tissue are called adipocytes.
C- Tendon
• The tissue that attract muscles to bones are called tendons.
• They have great tensile strength and less flexibility.
D- Ligament
• This tissue attaches bones to bones.
• It is elastic in nature.
• It has great strength.
• It strengthens the joint and allows normal movement.
E- Bones
• They provide structural framework to the body.
• They anchor the muscles and support the main organs of the body.
F- Blood
• It is a fluid connective tissue.
• It consists of cells, such as RBCs (Red blood Cells), WBC (White blood Cells) , and Platelets.
• Blood circulates through the blood vessels — arteries, veins and capillaries.
• Its functions include transport of respiratory gases, nutrients, hormones and vitamins to various parts of body and excretory products from various parts to kidney and liver.
G- Cartilage
• It smoothens bone surfaces at joints. • It is found in nose and ear.
3:- Muscular Tissue
Muscle tissue consists of many cylindrical, elongated cells alled muscle fibre. Muscle fibres contract and relax in a coordinated fashion to cause movement. Muscles are of three types.
A- Skeleton Muscles
• They are attached to bones
(muscles of limbs).
• These are also known as voluntary as we can contract these muscles according to our will.
B- Smooth Muscle
• They are found in the wall of alimentary canal, blood vessels, etc.
• It is not possible to contract these muscles according to our will, so these are also known as involuntary muscle.
C- Cardiac Muscles
• They are found only on heart walls.
• They are involuntary in nature.
• These show rhythmic contraction and relaxation throughout life.
4- Nervous Tissues
Cells of nervous tissues are called neurons. Neurons transmit information through the electrical and chemical signals. Brain, spinal cord and nerves are made up of neurons. Neurons are protected by another types of cell called neurological cell. Neurons consist of three major parts.
A- Cell body - Contains nucleus and cytoplasm.
B- Axon - Longest parts and carries impulses away from the cell body.
C- Dendrites- Short and branched parts arising from the cell body. They carry impulses towards cell body.
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