Question

50 marks question :
Please send me notes or brief description of Animal Tissue According to class 9 th

Answer 1

ANIMAL CELLS can be divided into 4 types:

1. EPITHELIAL TISSUE.
2.CONNECTIVE TISSUE.
3. MUSCULAR TISSUE.
4. NERVOUS TISSUE.

1.EPITHELIAL TISSUE:

STRUCTURE:

It is found in outer layers of cavities as in the mouth and on the external and internal exposed surface of body parts where they form a protective coating.

The cells of tissues are tightly packed and form a continuous sheet.

There is no intercellular space.

They lie on a delicate non-cellular,fibrous basement membrane which provides elastic support.

FUNCTION:

They protect the inner tissue from mechanical injury and prevent entry of germs and harmful chemicals.

They form a barrier to keep different body system separate.

They help in absorption of water and nutrients and also excretion of water.

TYPES:

SQUAMOUS EPITHELIUM.
CUBOIDAL EPITHELIUM.
COLUMNAR EPITHELIUM.
GLANDULAR EPITHELIUM.
CILIATED COLUMNAR EPITHELIUM.

CONNECTIVE TISSUE:

They are losely packed and embedded in a matrix which is of different types in different types of cells.

They are living and connect various parts of the body.

It has three types of matrix:

1. Liquid(fluid).
2. Jelly like.
3. Hard.

TYPES:

BONE(HARD).
ADIPOSE,TENDON LIGAMENT,AEROLAR,CARTILAGE(JELLY LIKE).
BLOOD(FLUID).

Blood has a matrix called as PLASMA.
Bone has a hard matrix made up of CALCIUM AND PHOSPHATE.
CARTILAGE is found in ears and nose.

MUSCULAR TISSUE:

VOLUNTARY:

STRIATED MUSCLE is the voluntary muscle that can be controlled by us.They contain a protein called CONTRACTILE PROTEIN.It is also called skeletal muscle.as they are mostly attached to bones.

INVOLUNTARY MUSCLES:

UNSTRIATED MUSCLES:

They are also called as SMOOTH MUSCLE.They are found in the iris of eye.They are SPINDLE SHAPED.They are uninucleated unlike Striated muscles which are multinucleated.

CARDIAC MUSCLE:

It is found only in the heart.It works as long as there is life in the body.They regularly contract and relax.They are also uninucleated.

NERVOUS TISSUE:

The cells of this tissue are called neurons.It consists of a nucleus and a cytoplasm.It has an axon.It has several dendrites.It allows rapid response to stimuli.It performs work in a fraction of seconds.

BE BRAINLY!!

Answer 2

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In multicellular organisms, a group of similar cells with intercellular substances perform specific function, such an aggregation of cells is called tissue. Organs are functional group of many tissues. The study of tissue is known as histology. The study of tissues in connection with diseases of tissues is known as histopathology. 

The word tissue is derived from a Latin word which means 'weave'. Cells that form tissues are woven together to form tissues. Tissues are sometimes held together by a sticky substance that coat the cells.

Animal Tissue Definition

Any distinct type of material animal cells are made of, which consists specialized cells and cellular products, which show inflammation reaction to any infection or injury are known as tissues. In animal, organs are made up of four basic types of tissues epithelial tissue, connective tissue, muscle tissue and nerve tissue. These tissues have distinctive features and specific functions which combine to form functioning organs.

Four Types of Animal Tissue

Animal tissues are of four basic types: Epithelial, Connective, Muscular and Neural tissues. Multiple tissues compose organs and body structures. Generally animals are said to made up of these basic four type of tissues, but the presence of these tissues may differ, depending on the type of organism. The origin of the cells of a type of tissues may differ in development stages in different classification of animals. 

Animal Tissues and their Function

The structure of the cell varies according to its function. The tissues are different and are classified into four types: 
Epithelial tissue Connective tissue Muscular tissue and Neural tissue.

Epithelial Tissue

Epithelial tissue is commonly referred to as epithelium. The epithelial tissue forms the outer covering or lining for some part of the body. It is composed of closely packed cells, arranged in flat sheets. Epithelial tissues forms the surface of the skin, lines many cavities of the body and covers the internal organs. 

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