Question

What are epithelial tissue? Where the found in our body. Name it's types


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Answer 1

Epithelium is one of the four basic types of animal tissue, along with connective tissue, muscle tissue and nervous tissue. It is a thin, continuous, protective layer of cells. Epithelial tissues line the outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs. An example is the epidermis, the outermost layer of the skin.
There are three principal shapes of epithelial cell: squamous, columnar, and cuboidal. These can be arranged in a single layer of cells as simple epithelium, either squamous, columnar, or cuboidal, or in layers of two or more cells deep as stratified (layered), or compound, either squamous, columnar or cuboidal. In some tissues, a layer of columnar cells may appear to be stratified due to the placement of the nuclei. This sort of tissue is called pseudostratified. All glands are made up of epithelial cells. Functions of epithelial cells include secretion, selective absorption, protection, transcellular transport, and sensing.
Epithelial layers contain no blood vessels, so they must receive nourishment via diffusion of substances from the underlying connective tissue, through the basement membrane. Cell junctions are well employed in epithelial tissues.

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Answer 2

$\sf{\huge{\underline{\green{\mathbb{Animal \: \: Tissue}}}}}$

ᴛʜᴇ ᴍᴀɪɴ ᴋɪɴᴅ ᴏғ ᴀɴɪᴍᴀʟ ᴛɪssᴜᴇs ᴀʀᴇ ᴀs ғᴏʟʟᴏᴡ

• ᴇᴘɪᴛʜᴇʟɪᴀʟ ᴛɪssᴜᴇ
• ᴄᴏɴɴᴇᴄᴛɪᴠᴇ ᴛɪssᴜᴇ
• ᴍᴜsᴄʟᴇ ᴛɪssᴜᴇ
• ɴᴇᴜʀᴀʟ ᴛɪssᴜᴇ

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ʜᴇʀᴇ , ᴡᴇ ᴡɪʟʟ ᴏɴʟʏ ᴇʟᴀʙᴏʀᴀᴛᴇ ᴇᴘɪᴛʜᴇʟɪᴀʟ ᴛɪssᴜᴇ

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$\sf{\huge{\underline{\green{\mathbb{ Epithelial \: Tissue }}}}}$

ᴇᴘɪᴛʜᴇʟɪᴀʟ ᴛɪssᴜᴇᴜ ɪs ᴀ ᴛʜɪɴ ᴘʀᴏᴛᴇᴄᴛɪᴠᴇ sʜᴇᴇᴛ ᴏғ ᴄᴇʟʟs .

$\sf{\blue{Location}}$

ɪᴛ ᴄᴏᴠᴇʀs ᴛʜᴇ sᴜʀғᴀᴄᴇ ᴏғ ᴛʜᴇ ʙᴏᴅʏ ᴀɴᴅ ʟɪɴᴇs ᴛʜᴇ ᴠᴀʀɪᴏᴜs ʙᴏᴅʏ ᴄᴀᴠɪᴛɪᴇs ᴀɴᴅ ɪɴᴛᴇʀɴᴀʟ ᴏʀɢᴀɴs , ɪɴᴄʟᴜᴅɪɴɢ ᴛʜᴇ ʙʟᴏᴏᴅ ᴠᴇssᴇʟ . ᴇxᴀᴍᴘʟᴇ :- ᴛʜᴇ ᴏᴜᴛᴇʀᴍᴏsᴛ ʟᴀʏᴇʀ ᴏғ sᴋɪɴ ᴀɴᴅ ᴛʜᴇ ʟɪɴɪɴɢ sᴜʀғᴀᴄᴇs ᴏғ ᴛʜᴇ ᴍᴏᴜᴛʜ , ɴᴏsᴇ , ʟᴜɴɢs , sᴛᴏᴍᴀᴄʜ ᴇᴛᴄ .

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$\sf{\blue{Shape}}$

ᴇᴘɪᴛʜᴇʟɪᴀʟ ᴄᴇʟʟs ᴍᴀʏ ʙᴇ ғʟᴀᴛ , ᴄᴜʙᴏɪᴅᴀʟ ᴏʀ ᴄᴏʟᴜᴍɴᴀʀ ɪɴ sʜᴀᴘᴇ.

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$\sf{\blue{Function}}$

- ᴛʜᴇ ᴇᴘɪᴛʜᴇʟɪᴀʟ ᴛɪssᴜᴇ ғᴜɴᴄᴛɪᴏɴs ғᴏʀ ᴘʀᴏᴛᴇᴄᴛɪᴏɴ ( ᴀs ᴏɴ sᴋɪɴ ) , ᴀʙsᴏʀᴘᴛɪᴏɴ , sᴇᴄʀᴇᴛɪᴏɴ ( ᴀs ɪɴ ɪɴᴛᴇsᴛɪɴᴇ ) , sᴇɴsᴏʀʏ ᴘᴇʀᴄᴇᴘᴛɪᴏɴ , ᴇᴛᴄ . ɪᴛs ғᴏᴜʀ sᴛʀᴜᴄᴛᴜʀᴀʟʟʏ ᴅɪsᴛɪɴᴄᴛ ᴄᴀᴛᴇɢᴏʀɪᴇs ᴀʀᴇ ᴀs ғᴏʟʟᴏᴡ :-

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$\sf{\pink{\underline{Squamous \: epithelium }}}$

ɪs ᴄᴏᴍᴘᴏsᴇᴅ ᴏғ ᴄᴇʟʟs , ᴡʜɪᴄʜ ɪs ᴛʜɪɴ , ғʟᴀᴛ ᴡɪᴛʜ ᴘʀᴏᴍɪɴᴇɴᴛ ɴᴜᴄʟᴇɪ ᴄʟᴏsᴇʟʏ ᴘᴀᴄᴋᴇᴅ . ᴇxᴀᴍᴘʟᴇ :- ғᴏᴜɴᴅ ʟɪɴɪɴɢ ᴛʜᴇ ᴍᴏᴜᴛʜ ᴀɴᴅ ɴᴀsᴀʟ ᴄᴀᴠɪᴛɪᴇs , ʙʟᴏᴏᴅ ᴠᴇssᴇʟs ᴀᴍᴅ ʟʏᴍᴘʜ ᴠᴇssᴇʟs .

ᴛʜᴇ sǫᴜᴀᴍᴏᴜs ᴇᴘɪᴛʜᴇʟɪᴜᴍ ᴘʀᴏᴛᴇᴄᴛs ᴛʜᴇ ᴜɴᴅᴇʀʟʏɪɴɢ ᴘᴀʀᴛs ғʀᴏᴍ ᴍᴇᴄʜᴀɴɪᴄᴀʟ ɪɴᴊᴜʀʏ , ɢᴇʀᴍs , ʜᴀʀᴍғᴜʟ ᴄʜᴇᴍɪᴄᴀʟ ᴀɴᴅ ᴅʀʏɪɴɢ ᴜᴘ .

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

$\sf{\pink{\underline{Stratified \: epithelium }}}$

: ғᴏᴜɴᴅ ɪɴ ᴛʜᴇ sᴋɪɴ ᴀɴᴅ ᴛʜᴇ ᴄᴏʀɴᴇᴀ . ɪᴛ ɪs ᴄᴏᴍᴘᴏsᴇᴅ ᴏғ sᴇᴠᴇʀᴀʟ ʟᴀʏᴇʀs ( sᴛʀᴀᴛᴀ ) ᴏғ ᴛʜᴇ sᴀᴍᴇ ᴏʀ ᴅɪғғᴇʀᴇɴᴛ ᴋɪɴᴅs ᴏғ ᴇᴘɪᴛʜᴇʟɪᴀʟ ᴛɪssᴜᴇ .

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$⠀\sf{\pink{\underline{ Cuboidal \:Tissue }}}$

- ɪs ғᴏᴜɴᴅ ɪɴ sᴏᴍᴇ ᴘᴀʀᴛs ᴏғ ᴋɪᴅɴᴇʏ ᴛᴜʙᴜʟᴇs ᴀɴᴅ ɪɴ sᴏᴍᴇ ɢʟᴀɴᴅᴜʟᴀʀ ᴅᴜᴄᴛ sᴜᴄʜ ᴀs ᴛʜᴏsᴇ ᴏғ sᴀʟɪᴠᴀʀʏ ɢʟᴀɴᴅs , ᴘᴀɴᴄʀᴇᴀᴛɪᴄ ᴅᴜᴄᴛ .

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$\sf{\pink{\underline{Columnar \: epithelium }}}$

- ᴄᴏɴᴛᴀɪɴs ᴠᴇʀᴛɪᴄᴀʟʟʏ ᴀʀʀᴀɴɢᴇᴅ ᴄʏʟɪɴᴅʀɪᴄᴀʟ ᴏʀ ʙʀɪᴄᴋ ʟɪʟᴇ ᴄᴇʟʟs . ᴛʜᴇsᴇ ᴄᴇʟʟs ᴀʀᴇ ᴜsᴜᴀʟʟʏ ᴛᴀʟʟ ɪɴ sɪᴢᴇ . ᴄᴏʟᴜᴍɴᴀʀ ᴇᴘɪᴛʜᴇʟɪᴜᴍ ɪs ɢᴇɴᴇʀᴀʟʟʏ ғᴏᴜɴᴅ ɪɴ ᴛʜᴇ ɪɴɴᴇʀ ʟɪɴɪɴɢs ᴏғ ᴛʜᴇ sᴛᴏᴍᴀᴄʜ ᴀɴᴅ ɪɴᴛᴇsᴛɪɴᴇs .

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• ᴄɪʟɪᴀᴛᴇᴅ ᴄᴏʟᴜᴍɴᴀʀ ᴇᴘɪᴛʜᴇʟɪᴜᴍ : ᴀᴛ sᴏᴍᴇ ᴘʟᴀᴄᴇs ɪɴ ᴛʜᴇ ʙᴏᴅʏ , sᴜᴄʜ ᴀs ɪɴ ᴛʜᴇ ʟɪɴɪɴɢ ᴏғ ᴛʜᴇ ᴛʀᴀᴄʜᴇᴀ ( ᴡɪɴᴅ ᴘɪᴘᴇ ) , ᴛʜᴇ ᴄᴏʟᴜᴍɴᴀʀ ᴇᴘɪᴛʜᴇʟɪᴜᴍ ʜᴀᴠᴇ ᴛʜʀᴇᴀᴅ ʟɪᴋᴇ ᴘʀᴏᴛᴏᴘʟᴀsᴍɪᴄ ᴘʀᴏᴊᴇᴄᴛɪᴏɴs ᴄᴀʟʟᴇᴅ ᴄɪʟɪᴀ , ᴀᴛ ᴛʜᴇʀᴇ ғʀᴇᴇ ᴇɴᴅs. ᴛʜᴇ ᴄɪʟɪᴀ ᴄᴏɴsᴛᴀɴᴛʟʏ ᴋᴇᴇᴘ ʟᴀsʜɪɴɢ ᴀɴᴅ ᴍᴏᴠᴇ ᴛʜᴇ ᴍᴀᴛᴇʀɪᴀʟ ᴡʜɪᴄʜ ᴇɴᴛᴇʀ ᴛʜᴇsᴇ ʀᴇɢɪᴏɴs .

• ɢʟᴀɴᴅᴜʟᴀʀ ᴇᴘɪᴛʜᴇʟɪᴜᴍ : ( ᴀʟsᴏ ᴀ ᴋɪɴᴅ ᴏғ ᴄᴏʟᴜᴍɴᴀʀ ᴇᴘɪᴛʜᴇʟɪᴜᴍ ) ᴄᴏɴᴛᴀɪɴs sᴏᴍᴇ ʟᴀʀɢᴇ ᴄᴇʟʟs ᴡʜɪᴄʜ sᴇᴄʀᴇᴛ ᴄᴇʀᴛᴀɪɴ ᴄʜᴇᴍɪᴄᴀʟ sᴜʙsᴛᴀɴᴄᴇs . sᴜᴄʜ ᴄᴇʟʟs ᴀʀᴇ ᴄᴏᴍᴍᴏɴ ɪɴ ᴛʜᴇ ʟɪɴɪɴɢ ᴏғ ᴛʜᴇ sᴛᴏᴍᴀᴄʜ ᴀɴᴅ ᴛʜᴇ ɪɴᴛᴇsᴛɪɴᴇ . ᴀᴛ ᴄᴇʀᴛᴀɪɴ ᴘʟᴀᴄᴇs ɪɴ ᴛʜᴇ ʙᴏᴅʏ ᴛʜᴇ ɢʟᴀɴᴅᴜʟᴀʀ ᴇᴘɪᴛʜᴇʟɪᴜᴍ ɪs ғᴏʟᴅᴇᴅ ɪɴᴡᴀʀᴅ ᴛᴏ ғᴏʀᴍ ᴄᴏᴍᴘᴀᴄᴛ , ʜᴏʟʟᴏᴡ ᴏʀ ᴛᴜʙᴜʟᴀʀ ɢʟᴀɴᴅs , ғᴏʀ ᴇxᴀᴍᴘʟᴇ :- ᴛʜᴇ sᴡᴇᴀᴛ ɢʟᴀɴᴅs , ᴛᴇᴀʀ ɢʟᴀɴᴅs ᴏʀ ᴛʜᴇ ʟɪᴠᴇʀ .