MEMBRANES:
It is a pliable sheet like structure acting as a
boundary,lining or partition in an organism.
Types of membranes:
1.
Epithelial membranes.
2.
Mucous membrane .
3.
Serous membrane.
4.
Synovial membrane.
EPITHELIAL MEMBRANES:-
These membranes are sheets of epithelial tissue and
supporting connective tissue that cover or line many internal structures or
cavities.
MUCUS MEMBRANES:-
MUCOSA.
The membrane surface consists of epithelial cells some of
which produce a secretion called MUCUS.
Mucus it’s a slimy tenacious fluid and moist slippery
surface.
Mucus protects the lining membrane from drying and
mechanical and chemical injury.
In respiratory tract traps inhaled foreign
particles,preventing them from entering the alveoli of the lungs.
SEROUS MEMBRANE:-
Serous membranes or serosa secrete serous watery fluid.
It consist of a double layer of loose areolar connective
tissue lined by simple squamous epithelium.
It contains 2 layers.
1)
Parietal layer lines cavity.
2)
Visceral layer surrounds organs.
2 layers separated by serous fluid.
Cites of serous membrane:-
1)
Pleura lining the thoracic cavity surrounding
the lungs.
2)
Pericardium lining the pericardial cavity
surrounding the heart.
3)
Peritoneum lining the abdominal cavity
surrounding the abdominal cavity.
The serous fluid between the visceral and parietal layers
enables an organ to glide freely within the cavity without being damaged by
friction between adjacent organs.
The heart changes its shape and size during each beat and
friction.
SYNOVIAL MEMBRANE :-
This membrane lines the cavities of movable joints and
surrounds tendons that could be injured by rubbing against bones.
Example : over the wrist joint.
Synovial membranes secretes clear, sticky,oily.synovial
fluid, which lubricates and nourishes the joints.
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