What is connective tissue
It connects and support all the other tissues,the intercellular element predominating. The cellular element is usually scanty.In function this tissue may be mechanical ,nutritive and defensive.It is a tissue made up of matrix(abundant intercellular substance or ground substance) and living cells that connects and support different tissue.All connective tissues in the body are formed by mesoderm.
There are large intercellular space between the cell.Intercellular spaces are filled with large amount of extracellular materials formed of insoluble protein fibres lying in an amorphous, transparent ground substance called matrix.Ageing of an animal body is associated with deterioration in its connective tissues.
(i)Their chief function is to bind other tissues together in the organs.
(ii) Certain connective tissues such as adipose tissues store fat.
(iii) Skeletal connective tissue like bones and cartilages provide the body with a supporting skeletal frame work.
(iv) Fluid connective tissues such as blood and lymph transport various materials in the body.
(v) Plasma cells synthesize, antibodies, viz.,macrophages. Lymphocytes ingest cell debris,harmful bacteria and foreign matter.Thus these cells of connective tissues are protective in function.
(vi) The jelly-like ground substance of connective tissues acts as shock absorber around some organs such as eye balls and kidneys.
(vii) The bone marrow produces blood cells.
(viii)Areolar tissue acts as packing material in various organs.
(ix)Collagen fibres of connective tissue help in repair of injured tissues.
Types of connective tissues
Connective tissue proper possess soft viscous semisolid or semi-fluid matrix.It is divided into following types:
Areolar tissue is loose connective tissue,possess transparent gelatinous, highly vascular and sticky matrix which have variety of cells and fibres.It allows movement of part connected by it(Muscle and their compound).Areolar tissue mainly consist of different types of cells and fibres.
These are the most abundant cells,produce fibres,called as fibroblasts in their young active phase and fibrocytes when old and inactive.It synthesize proteins(Collagen, elastin and reticulin).These are undifferentiated mesenchyme stem cells,capable to give rise other cells of connective tissue.Collagen and elastin are formed by firbroblasts.
Histiocytes or Macrophages or Clasmatocytes:
These are polymorphic cells.These are amoeboid cells and are main phagocytes of connective tissue.They are having most active lysosomes and phagocytise dead cells and pathogens.Macrophages remove the dead and damaged cells and clean the body so called scavenger cell. All types of macrophages take part in phagocytosis.