BIOM 2000 Lecture Notes - Lecture 6: Post-Nasal Drip, Paranasal Sinuses, Nasal Septum
4 Mar 2017
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Document Summary
Includes nose, pharynx, larynx, trachea, bronchi and their small branches, and lungs. The nose: only externally visible part of the respiratory system, during breathing. Air comes in the nose by passing through nostrils. Interior consists of the nasal cavity divided by the nasal septum: olfactory receptors. Located in mucosa, beneath the ethmoid bone: respiratory mucosa. Thin walled veins that warm the air as it flows past. Nose bleeds happen b/c of the superficial location of these blood vessels. Sticky mucus moistens air and traps bacteria and other foreign debris. Ciliated cells create a current the moves the sheet of contaminated mucus to be. Lysosome enzyme destroys bacteria chemically swallowed and digested by stomach juices. When in cold weather, the cilia become sluggish, and mucus will accumulate in nasal cavity: results in a runny nose, conchae. Greatly increase the surface area of mucosa exposed to air. Increased air turbulence in nasal cavity: palate. Separated nasal cavity from the oral cavity.
