Question

what is the meaning of vein​

Answer 1

Answer:

one of the tubes which carry blood from all parts of your body to your heart

Answer 2

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• ᴀ ʙʟᴏᴏᴅ ᴠᴇssᴇʟ ᴛʜᴀᴛ ᴄᴀʀʀɪᴇs ʙʟᴏᴏᴅ ᴛʜᴀᴛ ɪs ʟᴏᴡ ɪɴ ᴏxʏɢᴇɴ ᴄᴏɴᴛᴇɴᴛ ғʀᴏᴍ ᴛʜᴇ ʙᴏᴅʏ ʙᴀᴄᴋ ᴛᴏ ᴛʜᴇ ʜᴇᴀʀᴛ.
• ᴛʜᴇ ᴅᴇᴏxʏɢᴇɴᴀᴛᴇᴅ ғᴏʀᴍ ᴏғ ʜᴇᴍᴏɢʟᴏʙɪɴ (ᴅᴇᴏxʏ-ʜᴇᴍᴏɢʟᴏʙɪɴ) ɪɴ ᴠᴇɴᴏᴜs ʙʟᴏᴏᴅ ᴍᴀᴋᴇs ɪᴛ ᴀᴘᴘᴇᴀʀ ᴅᴀʀᴋ. 
• ᴠᴇɪɴs ᴀʀᴇ ᴘᴀʀᴛ ᴏғ ᴛʜᴇ ᴀғғᴇʀᴇɴᴛ ᴡɪɴɢ ᴏғ ᴛʜᴇ ᴄɪʀᴄᴜʟᴀᴛᴏʀʏ sʏsᴛᴇᴍ, ᴡʜɪᴄʜ ʀᴇᴛᴜʀɴs ʙʟᴏᴏᴅ ᴛᴏ ᴛʜᴇ ʜᴇᴀʀᴛ.