This document discusses the four main types of tissues in the human body - epithelial, connective, muscular and nervous tissue. It provides details on the classification, structure and functions of each type of tissue. Epithelial tissues cover surfaces and line passageways. Connective tissues support and bind other tissues. Muscular tissues contract to produce movement. Nervous tissues transmit signals between parts of the body and coordinate functions.

1. TISSUE CLASSIFICATION
● PRAVEEN. M (117012305041)
● 2nd-year
(NANOTECHNOLOGY)
● TECHNICAL
COMMUNICATION

2. CONTENT
● What is meant by Tissue?
● Tissue Classification
● Types of tissue and its function

3. TISSUE
● Tissue is a cellular organizational level between cells and a complete organ.
● A tissue is an ensemble of similar cells and their extracellular matrix from
the same origin that together carry out a specific function.
● Organs are then formed by the functional grouping together of multiple
tissues.

4. CLASSIFICATION
There are four types of tissues basically on their function
.Hence they are:
● Epithelial tissue
● Muscular tissue
● Nervous tissue
● Connective tissue

5. EPITHELIAL TISSUE
● Epithelial tissue, also referred to as epithelium, refers to the sheets of cells
that cover exterior surfaces of the body, lines internal cavities and
passageways, and forms certain glands.
● Glands, such as exocrine and endocrine, are composed of epithelial tissue and
classified based on how their secretions are released.
● Epithelial layers are avascular but innervated.

6. FUNCTION OF EPITHELIAL TISSUE
1. Protection for the underlying tissues from radiation, desiccation, toxins, and
physical trauma.
2. Absorption of substances in the digestive tract lining with distinct modifications.
3. Regulation and excretion of chemicals between the underlying tissues and the
body cavity.
4. The secretion of hormones into the blood vascular system. The secretion of
sweat, mucus, enzymes, and other products that are delivered by ducts come
from the glandular epithelium.
5. The detection of sensation.

7. CONNECTIVE TISSUE
● Connective tissue, group of tissues in the body that maintain the form of the body
and its organs and provide cohesion and internal support.
● The connective tissues include several types of fibrous tissue that vary only in their
density and cellularity, as well as the more specialized and recognizable variants—
bone, ligaments, tendons, cartilage, and adipose(fat) tissue.
● There are THREE types of connective tissue.
1. Connective tissue
2. Reticular tissue
3. Dense tissue

8. FUNCTION OF CONNECTIVE TISSUE
1. The plasma cells are capable of producing antibodies against specific antigens (foreign proteins).
2. The mast cells, by producing histamine and serotonin, are responsible for the various
inflammatory, allergic and hypersensitivity reactions.
3. Pigment cells protect the skin against ultraviolet radiation, so that the inflammatory changes
typical sunburn do not occur, and the chromosomal damage in the dividing cells of epidermis is
avoided.
4. Connective tissue contains mesenchymal cells of embryonic type. These are capable of
transformation into each type of the connective tissue cells with their discrete functions.

9. MUSCULAR TISSUE
● Muscular (contractile) tissue is composed of cells called muscle fibers .
● Muscle fibers contain actin and myosin, which are protein filaments whose
interaction accounts for movement.
● The three types of vertebrate muscles are ,
1. Cardiac muscle
2. Skeleton muscle
3. Smooth muscle

10. FUNCTION OF MUSCLE TISSUE
● Pumping of blood
● Movement to our body
● Communication
● Respiration

11. NERVOUS TISSUE
● Nervous tissue is one of four major classes of tissues and makes up the central nervous system and the
peripheral nervous system.
● Integration and communication are the two major functions of nervous tissue.
● Nervous tissue contains two categories of cells — neurons and neuroglia.
● Neurons are highly specialized nerve cells that generate and conduct nerve impulses.
● Neuroglia are supporting cells that provide physical sport, remove debris, and provide electrical
insulation.

12. FUNCTION OF NEURON TISSUE
● Sensory input
● Mental activities
● Control of muscles and glands
● Integration