CONNECTIVE TISSUE CLASS IX

The connective tissue is specialized to connect

and anchor various body organs.

It connects the bones to each other,  bind the

tissues and give support to various parts of the

body by creating a  packing around the organs,

Thus the main function  of the tissue are  binding 

supporting and packing.

The cells of the tissue are living and are separated

from each other

A homogenous  gel  like intercellular substance

called the medium  or matrix forms the bulk of the

connective tissue,examples of connective tissue 

Blood ,Bone ,Cartilage, Ligament, Tendon, Areolar

 tissue,Adipose tissue

Blood---Is a fluid connective tissue containg:-

RBC

WBC

 PLATELETS

PLASMA

RBC

Its  large  in number and have iron containing red respiratory pigment called haemoglobin.The RBC is also known  as the erythrocytes, they transport oxygen

WBC 

They lack haemoglobin ,main function is defence and developing immunity .They are of five types

Neutrophils

Basophils

Eosinophils

Lymphocytes

Monocyte

Platelets

they help in clotting of blood and prevent blood loss.

Plasma -It  is the fluid in which all the three cells are embedded . It also contains water, food ,enzymes ,hormones and other substances .It distributes useful substances and collects waste from the cells of the body.

Bone and cartilage

Bone is a hard, non flexible connective tissue which has matrix filled with calcium and phosphorus e.g femur bone.

Cartilage-

It is flexible and has cells which are widely spaced .The matrix of cartilage has sugar with very less calcium and phosphorus eg ear ,nose .

Ligament and tendon

Ligament connects bone to bone .It is flexible and has yellow fibres.

Tendon -Connects bone to muscle .it is made up of white fibres .they are more fibrous with limited flexibility.

AREOLAR OR THE LOOSE CONNECTIVE TISSUE

The tissue is found between the skin and the  muscles, around

the blood vessels and the nerves and in the  bone marrow.

It fills the space inside the organs

It supports the internal organs and helps in repair of tissues after an injury

Its matrix consist of two kinds of fibres

The white collagen fibres

The yellow elastic fibres or elastin

Also scattered in the matrix are several irregular cells 

Mast cells 

Fibrocytes 

plasma cells 

macrophages

Adipose tissue 

The cells are fills with fat and mainly help in providing insulation and reserve energy .The cells are mainly present below the skin and inbetween the organs also.