Question

what is the function of IgA in the body? ​

Answer 1

Immunoglobulin A (IgA), as the principal antibody class in the secretions that bathe these mucosal surfaces, acts as an important first line of defence. IgA, also an important serum immunoglobulin, mediates a variety of protective functions through interaction with specific receptors and immune mediators.

Answer 2

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ɪᴍᴍᴜɴᴏɢʟᴏʙᴜʟɪɴ ᴀ (ɪɢᴀ) ɪs ᴛʜᴇ ᴍᴏsᴛ ᴀʙᴜɴᴅᴀɴᴛ ᴛʏᴘᴇ ᴏғ ᴀɴᴛɪʙᴏᴅʏ ɪɴ ᴛʜᴇ ʙᴏᴅʏ, ᴄᴏᴍᴘʀɪsɪɴɢ ᴍᴏsᴛ ᴏғ ᴛʜᴇ ɪᴍᴍᴜɴᴏɢʟᴏʙᴜʟɪɴ ɪɴ sᴇᴄʀᴇᴛɪᴏɴs ᴀɴᴅ ᴀ sɪɢɴɪғɪᴄᴀɴᴛ ᴀᴍᴏᴜɴᴛ ᴏғ ᴄɪʀᴄᴜʟᴀᴛɪɴɢ ɪᴍᴍᴜɴᴏɢʟᴏʙᴜʟɪɴ. ɪɴ sᴇᴄʀᴇᴛɪᴏɴs, ɪᴛ sᴇʀᴠᴇs ᴛᴏ ᴘʀᴏᴛᴇᴄᴛ ᴛʜᴇ ᴍᴜᴄᴏsᴀʟ ᴛɪssᴜᴇs ғʀᴏᴍ ᴍɪᴄʀᴏʙɪᴀʟ ɪɴᴠᴀsɪᴏɴ ᴀɴᴅ ᴍᴀɪɴᴛᴀɪɴ ɪᴍᴍᴜɴᴇ ʜᴏᴍᴇᴏsᴛᴀsɪs ᴡɪᴛʜ ᴛʜᴇ ᴍɪᴄʀᴏʙɪᴏᴛᴀ.

ɪᴛs ᴍᴀɪɴ ғᴜɴᴄᴛɪᴏɴ:-

ɪᴍᴍᴜɴᴏɢʟᴏʙᴜʟɪɴ ᴀ (ɪɢᴀ), ᴀs ᴛʜᴇ ᴘʀɪɴᴄɪᴘᴀʟ ᴀɴᴛɪʙᴏᴅʏ ᴄʟᴀss ɪɴ ᴛʜᴇ sᴇᴄʀᴇᴛɪᴏɴs ᴛʜᴀᴛ ʙᴀᴛʜᴇ ᴛʜᴇsᴇ ᴍᴜᴄᴏsᴀʟ sᴜʀғᴀᴄᴇs, ᴀᴄᴛs ᴀs ᴀɴ ɪᴍᴘᴏʀᴛᴀɴᴛ ғɪʀsᴛ ʟɪɴᴇ ᴏғ ᴅᴇғᴇɴᴄᴇ. ɪɢᴀ, ᴀʟsᴏ ᴀɴ ɪᴍᴘᴏʀᴛᴀɴᴛ sᴇʀᴜᴍ ɪᴍᴍᴜɴᴏɢʟᴏʙᴜʟɪɴ, ᴍᴇᴅɪᴀᴛᴇs ᴀ ᴠᴀʀɪᴇᴛʏ ᴏғ ᴘʀᴏᴛᴇᴄᴛɪᴠᴇ ғᴜɴᴄᴛɪᴏɴs ᴛʜʀᴏᴜɢʜ ɪɴᴛᴇʀᴀᴄᴛɪᴏɴ ᴡɪᴛʜ sᴘᴇᴄɪғɪᴄ ʀᴇᴄᴇᴘᴛᴏʀs ᴀɴᴅ ɪᴍᴍᴜɴᴇ ᴍᴇᴅɪᴀᴛᴏʀs.

ᴡʜʏ ᴅᴏᴇs ɪᴛ ᴘʀᴏᴛᴇᴄᴛ ᴛʜᴇ ʙᴏᴅʏ....

ʀᴇᴀsᴏɴ:-

ɪᴍᴍᴜɴᴏɢʟᴏʙᴜʟɪɴ ᴀ (ɪɢᴀ) ɪᴍᴍᴜɴᴏɢʟᴏʙᴜʟɪɴ ᴀ (ɪɢᴀ) ɪs ᴛʜᴇ ғɪʀsᴛ ʟɪɴᴇ ᴏғ ᴅᴇғᴇɴᴄᴇ ɪɴ ᴛʜᴇ ʀᴇsɪsᴛᴀɴᴄᴇ ᴀɢᴀɪɴsᴛ ɪɴғᴇᴄᴛɪᴏɴ, ᴠɪᴀ ɪɴʜɪʙɪᴛɪɴɢ ʙᴀᴄᴛᴇʀɪᴀʟ ᴀɴᴅ ᴠɪʀᴀʟ ᴀᴅʜᴇsɪᴏɴ ᴛᴏ ᴇᴘɪᴛʜᴇʟɪᴀʟ ᴄᴇʟʟs ᴀɴᴅ ʙʏ ɴᴇᴜᴛʀᴀʟɪsᴀᴛɪᴏɴ ᴏғ ʙᴀᴄᴛᴇʀɪᴀʟ ᴛᴏxɪɴs ᴀɴᴅ ᴠɪʀᴜs, ʙᴏᴛʜ ᴇxᴛʀᴀ- ᴀɴᴅ ɪɴᴛʀᴀᴄᴇʟʟᴜʟᴀʀʟʏ.

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