the trachea and bronchi are lined by
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The conducting passageways of the respiratory system (nasal cavity, trachea, bronchi and bronchioles) are lined by pseudostratified columnar epithelial tissue, which is ciliated and which includes mucus-secreting goblet cells.
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ᴛʜᴇ ᴄᴏɴᴅᴜᴄᴛɪɴɢ ᴘᴀssᴀɢᴇᴡᴀʏs ᴏғ ᴛʜᴇ ʀᴇsᴘɪʀᴀᴛᴏʀʏ sʏsᴛᴇᴍ (ɴᴀsᴀʟ ᴄᴀᴠɪᴛʏ, ᴛʀᴀᴄʜᴇᴀ, ʙʀᴏɴᴄʜɪ ᴀɴᴅ ʙʀᴏɴᴄʜɪᴏʟᴇs) ᴀʀᴇ ʟɪɴᴇᴅ ʙʏ ᴘsᴇᴜᴅᴏsᴛʀᴀᴛɪғɪᴇᴅ ᴄᴏʟᴜᴍɴᴀʀ ᴇᴘɪᴛʜᴇʟɪᴀʟ ᴛɪssᴜᴇ, ᴡʜɪᴄʜ ɪs ᴄɪʟɪᴀᴛᴇᴅ ᴀɴᴅ ᴡʜɪᴄʜ ɪɴᴄʟᴜᴅᴇs ᴍᴜᴄᴜs-sᴇᴄʀᴇᴛɪɴɢ ɢᴏʙʟᴇᴛ ᴄᴇʟʟs.
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