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So now let's discuss the general features of connective
tissue. Connective tissue is made up
of 2 basic components. You have the cells of the connective
tissue and then you have the
extracellular matrix which is all the stuff outside of the
cell. Connective tissue cells do not
have any free surfaces unlike our epithelial cells and as
well the connective tissue is highly
vascularized and has a nerve supply unlike the epithelial
tissue which did not contain any
blood vessels. The exceptions to this rule include the
tendons and the cartilage which do not
have a high vasculature as well as very little nerve supply.
So, there are 3 different types of
tissue cells found in connective tissue. There are
fibroblasts, adipocytes, and also several
different types of white blood cells. First, the fibroblasts
are large flat cells that are able to
There are also type of cells that live within the
mineralized connective tissue or bone.
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These cells include osteoblasts, osteoclasts, osteocytes and
bone lining cells.
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different types of white blood cells. First, the fibroblasts
are large flat cells that are able to
move to the connective tissue and their general function is
to secrete the extracellular
matrix. This is going to include the fibers and the ground
substance that surrounds the cells.
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The 2nd type of cell found in connective tissue is
adipocytes. Adipocytes are fat cells that
store a large amount of triglycerides. As you can see, they
almost look like they're empty
but in fact they are not empty, that is actually a large
content of triglycerides. This is
going to be found below the skin in the subcutaneous level
as well as in the fatty tissue that
surrounds a lot of your different organs. Another type of
connective tissue cell is macrophages.
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This is one of several different types of white blood cells
found in connective tissue.
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Macrophages are there to destroy the bacteria that get into
the connective tissue and they
do this by phagocytosing the bacteria and chopping it up
into little bitty pieces. Another white
blood cell is eosinophils. Eosinophils are especially used
for fighting off parasitic infections
and are also found in allergic reactions. A 3rd type of
white blood cell found in connective
tissue is neutrophils. Like macrophages, these are there to
destroy different types of microbes
using phagocytosis. Another type of white blood cell found
in our connective tissue are
different types of plasma cells. These cells developed from
B cells or B lymphocytes and they
are there to secrete antibodies that are used to attack
foreign substances. If there is an
allergic reaction or an inflammatory response, we also have
the presence of mass cells which
is another type of white blood cell found in the connective
tissue. The mass cells are going to
produce and secrete histamine and this allows for the
dilation of blood vessels as well as
the inflammatory response that's able to kill bacteria.