Question

If all alveoli of lungs are spread out they will cover​

Answer 1

Explanation:

Although they're microscopic, alveoli are the workhorses of your respiratory system. You have about 480 million alveoli, located at the end of bronchial tubes. When you breathe in, the alveoli expand to take in oxygen. When you breathe out, the alveoli shrink to expel carbon dioxide.

Answer 2

Explanation:

ᴇxᴘʟᴀɴᴀᴛɪᴏɴ:

ᴀʟᴛʜᴏᴜɢʜ ᴛʜᴇʏ'ʀᴇ ᴍɪᴄʀᴏsᴄᴏᴘɪᴄ, ᴀʟᴠᴇᴏʟɪ ᴀʀᴇ ᴛʜᴇ ᴡᴏʀᴋʜᴏʀsᴇs ᴏғ ʏᴏᴜʀ ʀᴇsᴘɪʀᴀᴛᴏʀʏ sʏsᴛᴇᴍ. ʏᴏᴜ ʜᴀᴠᴇ ᴀʙᴏᴜᴛ ᴍɪʟʟɪᴏɴ ᴀʟᴠᴇᴏʟɪ, ʟᴏᴄᴀᴛᴇᴅ ᴀᴛ ᴛʜᴇ ᴇɴᴅ ᴏғ ʙʀᴏɴᴄʜɪᴀʟ ᴛᴜʙᴇs. ᴡʜᴇɴ ʏᴏᴜ ʙʀᴇᴀᴛʜᴇ ɪɴ, ᴛʜᴇ ᴀʟᴠᴇᴏʟɪ ᴇxᴘᴀɴᴅ ᴛᴏ ᴛᴀᴋᴇ ɪɴ ᴏxʏɢᴇɴ. ᴡʜᴇɴ ʏᴏᴜ ʙʀᴇᴀᴛʜᴇ ᴏᴜᴛ, ᴛʜᴇ ᴀʟᴠᴇᴏʟɪ sʜʀɪɴᴋ ᴛᴏ ᴇxᴘᴇʟ ᴄᴀʀʙᴏɴ ᴅɪᴏxɪᴅᴇ.