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There are four types of tissues found inanimals: epithelial tissue, connectivetissue, muscle tissue, and nervoustissue.
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ᴡʜᴀᴛ ᴀʀᴇ ᴀɴɪᴍᴀʟ ᴛɪꜱꜱᴜᴇꜱ?
Animal tissues are classified into four types based on the functions they perform:
(i) Epithelial
(ii) Connective
(iii) Muscular
(iv) Nervous
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(i) Epithelial tissues
They form the covering of the external surfaces, internal cavities and organs of the animal body.
Epithelial tissue cells are tightly packed and form a continuous sheet.
The skin, the lining of the mouth, the lining of blood vessels, lung alveoli and kidney tubules are all made of epithelial tissue.
Functions of Epithelial Tissue:
(i) Epithelitum covers most organs and cavities within the body.
(ii) It also forms a barrier to keep different body systems separate.
(iii) The permeability of the cells of various epithelia play an important role in regulating the exchange of materials between the body and the external environment.
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(ii) Connective tissues
The cells of connective tissue are loosely spaced and embedded in an intercellular matrix.
They are specialised to connect various body organs.
For example:
Blood (plasma), bones, Cartilage. ligaments and tendons etc.
Plasma: The fluid (liquid) matrix of blood is called plasma.
Plasma is a yellowish liquid like material.
Plasma contains three types of blood cells suspended in it. These are:
(i) RBC - Red blood cells
(ii) WBC - White blood Cells
(iii) Platelets
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