Biology, asked by yashwarke23, 7 months ago

Give resion zona pellucida is refained for some time

Answers

Answered by Anonymous

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ᴛʜᴇ ᴢᴏɴᴀ ᴘᴇʟʟᴜᴄɪᴅᴀ sᴜᴘᴘᴏʀᴛs ᴄᴏᴍᴍᴜɴɪᴄᴀᴛɪᴏɴ ʙᴇᴛᴡᴇᴇɴ ᴏᴏᴄʏᴛᴇs ᴀɴᴅ ғᴏʟʟɪᴄʟᴇ ᴄᴇʟʟs ᴅᴜʀɪɴɢ ᴏᴏɢᴇɴᴇsɪs; ᴘʀᴏᴛᴇᴄᴛs ᴏᴏᴄʏᴛᴇs, ᴇɢɢs, ᴀɴᴅ ᴇᴍʙʀʏᴏs ᴅᴜʀɪɴɢ ᴅᴇᴠᴇʟᴏᴘᴍᴇɴᴛ, ᴀɴᴅ ʀᴇɢᴜʟᴀᴛᴇs ɪɴᴛᴇʀᴀᴄᴛɪᴏɴs ʙᴇᴛᴡᴇᴇɴ ᴏᴠᴜʟᴀᴛᴇᴅ ᴇɢɢs ᴀɴᴅ ғʀᴇᴇ-sᴡɪᴍᴍɪɴɢ sᴘᴇʀᴍ ᴅᴜʀɪɴɢ ᴀɴᴅ ғᴏʟʟᴏᴡɪɴɢ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ

ᴛʜᴇ ᴢᴏɴᴀ ᴘᴇʟʟᴜᴄɪᴅᴀ (ᴘʟᴜʀᴀʟ ᴢᴏɴᴀᴇ ᴘᴇʟʟᴜᴄɪᴅᴀᴇ, ᴀʟsᴏ ᴇɢɢ ᴄᴏᴀᴛ ᴏʀ ᴘᴇʟʟᴜᴄɪᴅ ᴢᴏɴᴇ) ɪs ᴀ ɢʟʏᴄᴏᴘʀᴏᴛᴇɪɴ ʟᴀʏᴇʀ sᴜʀʀᴏᴜɴᴅɪɴɢ ᴛʜᴇ ᴘʟᴀsᴍᴀ ᴍᴇᴍʙʀᴀɴᴇ ᴏғ ᴍᴀᴍᴍᴀʟɪᴀɴ ᴏᴏᴄʏᴛᴇs. ɪᴛ ɪs ᴀ ᴠɪᴛᴀʟ ᴄᴏɴsᴛɪᴛᴜᴛɪᴠᴇ ᴘᴀʀᴛ ᴏғ ᴛʜᴇ ᴏᴏᴄʏᴛᴇ. ᴛʜᴇ ᴢᴏɴᴀ ᴘᴇʟʟᴜᴄɪᴅᴀ ғɪʀsᴛ ᴀᴘᴘᴇᴀʀs ɪɴ ᴜɴɪʟᴀᴍɪɴᴀʀ ᴘʀɪᴍᴀʀʏ ᴏᴏᴄʏᴛᴇs. ɪᴛ ɪs sᴇᴄʀᴇᴛᴇᴅ ʙʏ ʙᴏᴛʜ ᴛʜᴇ ᴏᴏᴄʏᴛᴇ ᴀɴᴅ ᴛʜᴇ ᴏᴠᴀʀɪᴀɴ ғᴏʟʟɪᴄʟᴇs. ᴛʜᴇ ᴢᴏɴᴀ ᴘᴇʟʟᴜᴄɪᴅᴀ ɪs sᴜʀʀᴏᴜɴᴅᴇᴅ ʙʏ ᴛʜᴇ ᴄᴏʀᴏɴᴀ ʀᴀᴅɪᴀᴛᴀ. ᴛʜᴇ ᴄᴏʀᴏɴᴀ ɪs ᴄᴏᴍᴘᴏsᴇᴅ ᴏғ ᴄᴇʟʟs ᴛʜᴀᴛ ᴄᴀʀᴇ ғᴏʀ ᴛʜᴇ ᴇɢɢ ᴡʜᴇɴ ɪᴛ ɪs ᴇᴍɪᴛᴛᴇᴅ ғʀᴏᴍ ᴛʜᴇ ᴏᴠᴀʀʏ.

ᴛʜɪs sᴛʀᴜᴄᴛᴜʀᴇ ʙɪɴᴅs sᴘᴇʀᴍᴀᴛᴏᴢᴏᴀ, ᴀɴᴅ ɪs ʀᴇϙᴜɪʀᴇᴅ ᴛᴏ ɪɴɪᴛɪᴀᴛᴇ ᴛʜᴇ ᴀᴄʀᴏsᴏᴍᴇ ʀᴇᴀᴄᴛɪᴏɴ. ɪɴ ᴛʜᴇ ᴍᴏᴜsᴇ (ᴛʜᴇ ʙᴇsᴛ ᴄʜᴀʀᴀᴄᴛᴇʀɪsᴇᴅ ᴍᴀᴍᴍᴀʟɪᴀɴ sʏsᴛᴇᴍ), ᴛʜᴇ ᴢᴏɴᴀ ɢʟʏᴄᴏᴘʀᴏᴛᴇɪɴ, ᴢᴘ3, ɪs ʀᴇsᴘᴏɴsɪʙʟᴇ ғᴏʀ sᴘᴇʀᴍ ʙɪɴᴅɪɴɢ, ᴀᴅʜᴇʀɪɴɢ ᴛᴏ ᴘʀᴏᴛᴇɪɴs ᴏɴ ᴛʜᴇ sᴘᴇʀᴍ ᴘʟᴀsᴍᴀ ᴍᴇᴍʙʀᴀɴᴇ. ᴢᴘ3 ɪs ᴛʜᴇɴ ɪɴᴠᴏʟᴠᴇᴅ ɪɴ ᴛʜᴇ ɪɴᴅᴜᴄᴛɪᴏɴ ᴏғ ᴛʜᴇ ᴀᴄʀᴏsᴏᴍᴇ ʀᴇᴀᴄᴛɪᴏɴ, ᴡʜᴇʀᴇʙʏ ᴀ sᴘᴇʀᴍᴀᴛᴏᴢᴏᴏɴ ʀᴇʟᴇᴀsᴇs ᴛʜᴇ ᴄᴏɴᴛᴇɴᴛs ᴏғ ᴛʜᴇ ᴀᴄʀᴏsᴏᴍᴀʟ ᴠᴇsɪᴄʟᴇ. ᴛʜᴇ ᴇxᴀᴄᴛ ᴄʜᴀʀᴀᴄᴛᴇʀɪsᴀᴛɪᴏɴ ᴏғ ᴡʜᴀᴛ ᴏᴄᴄᴜʀs ɪɴ ᴏᴛʜᴇʀ sᴘᴇᴄɪᴇs ʜᴀs ʙᴇᴄᴏᴍᴇ ᴍᴏʀᴇ ᴄᴏᴍᴘʟɪᴄᴀᴛᴇᴅ ᴀs ғᴜʀᴛʜᴇʀ ᴢᴏɴᴀ ᴘʀᴏᴛᴇɪɴs ʜᴀᴠᴇ ʙᴇᴇɴ ɪᴅᴇɴᴛɪғɪᴇᴅ.

ɪɴ ʜᴜᴍᴀɴs, ғɪᴠᴇ ᴅᴀʏs ᴀғᴛᴇʀ ᴛʜᴇ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ, ᴛʜᴇ ʙʟᴀsᴛᴏᴄʏsᴛ ᴘᴇʀғᴏʀᴍs ᴢᴏɴᴀ ʜᴀᴛᴄʜɪɴɢ; ᴛʜᴇ ᴢᴏɴᴀ ᴘᴇʟʟᴜᴄɪᴅᴀ ᴅᴇɢᴇɴᴇʀᴀᴛᴇs ᴀɴᴅ ᴅᴇᴄᴏᴍᴘᴏsᴇs, ᴛᴏ ʙᴇ ʀᴇᴘʟᴀᴄᴇᴅ ʙʏ ᴛʜᴇ ᴜɴᴅᴇʀʟʏɪɴɢ ʟᴀʏᴇʀ ᴏғ ᴛʀᴏᴘʜᴏʙʟᴀsᴛɪᴄ ᴄᴇʟʟs. ᴛʜᴇ ᴢᴏɴᴀ ᴘᴇʟʟᴜᴄɪᴅᴀ ɪs ᴇssᴇɴᴛɪᴀʟ ғᴏʀ ᴏᴏᴄʏᴛᴇ ɢʀᴏᴡᴛʜ ᴀɴᴅ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ.

ᴛʜɪs ᴛʜɪᴄᴋ ᴍᴀᴛʀɪx ɪs ᴛʜᴏᴜɢʜᴛ ᴛᴏ ʙᴇ ғᴏʀᴍᴇᴅ ʙʏ sᴇᴄʀᴇᴛɪᴏɴs ғʀᴏᴍ ᴛʜᴇ ᴏᴏᴄʏᴛᴇ ᴀɴᴅ ᴛʜᴇ ғᴏʟʟɪᴄʟᴇ ɢʀᴀɴᴜʟᴏsᴀ ᴄᴇʟʟs ᴀɴᴅ ɪɴ ʜᴜᴍᴀɴ ᴏᴏᴄʏᴛᴇs ᴄᴏɴsɪsᴛs ᴏғ ғᴏᴜʀ ᴛʏᴘᴇs ᴏғ ᴢᴏɴᴀ ᴘᴇʟʟᴜᴄɪᴅᴀ ɢʟʏᴄᴏᴘʀᴏᴛᴇɪɴs ᴢᴘ1, ᴢᴘ2, ᴢᴘ3 ᴀɴᴅ ᴢᴘ4 ᴡʜɪᴄʜ ʜᴀᴠᴇ ᴅɪғғᴇʀᴇɴᴛ ʀᴏʟᴇs ɪɴ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ.

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