Definition
(Connective cells): Tissue that connects and binds the
cells and organs and ultimately gives support to the body is called connective
tissue.
Connective
tissue cells:
[A] Fixed cells:
1)
Fibroblasts.
2)
Adipocytes or Fat cells.
3)
Pericytes (Undifferentiated mesenchymal
cells)
4)
Certain macrophages (e.g Kupffer cells
of liver)
5)
Pigment cells.
[B] Transient cells:
(Free or wandering cells)
1)
Mast cells.
2)
Macrophages.
3)
Plasma cells.
4)
Leucocytes-
-Neutrophils.
-Eosinophils.
-Basophils.
-Monocytes.
Fibroblast
Definition:
This is the most common and numerous cells found in the connective tissue.
Functions:
1)
The fibroblast synthesizes collagen and
elastic fibers and glycosaminoglycans of amorphous intercellular substance.
2)
They help in healing of wounds by
depositing the ground substance.
Macrophages
Definition:
These are the phagocyting cells. These are also called histeocytes.
Functions:
1)
They phagocytose and digest the
particulate organic material, foreign bodies or microorganism and thereby
eliminate from the body.
2)
They also contribute to the
immunological reactions of the body.
3)
They ingest, process and store antigens
& pass specific information to neighbouring immunologically component
cells, such as lymphocytes and plasma cells.
Mast cells
Definition:
Mast cells are large, oval or round connective tissue cells whose cytoplasm is
filled with basophilic secretory granules.
Functions:
1)
Mast cells liberate heparin, which is
anticoagulant in function.
2)
Play an important role in all types of
allergic reactions like an anaphylactic shock.
Plasma cells: Plasma cells are large, ovoid cells,
present in most connective tissue. Their average lifespan is short 10-20 days.
Functions:
Principal functions of plasma cells are- Production of antibodies found in
blood streams, which help in defense mechanism.
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