ANHB2214 Study Guide - Midterm Guide: Collagen, Mesothelium, Microvillus

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Respiratory System:
Function of the respiratory system
o Clean, moisten and warm inspired air
o Gas exchange
o Contain the receptors for smell
o Air passing through the larynx can be used to provide speech
o Production and secretion of chemical messengers
o Can initiate immune responses against inhaled antigens
Parts of the respiratory system
o Conducting region passage of air to/from lungs
Nasal cavity
Nasopharynx
Larynx
Trachea
Bronchi
Bronchioles
Terminating bronchioles
o Respiratory portion gas exchange
Respiratory bronchioles
Alveolar ducts
Alveoli
Respiratory epithelium
o Ciliated pseudostratified columnar epithelium throughout most of
the conducting portion
o Epithelium traps and moves inhaled debris
o Abundant goblet cells that secrete mucus
o Epithelium changes to simple squamous in respiratory portion
Nasal cavities
o Vestibule
Most anterior and dilated
Outer portion enters nares (nostrils)
Sebaceous/sweat glands and hair inside
Function filter out large particles from inspired air
o Nasal fossae
2 cavernous chambers separated by osseous nasal septum
3 projections extending from lateral wall conchae
Middle and inferior conchae covered in respiratory
epithelium
Superior conchae covered in olfactory epithelium
Function of conchae
Increase surface area to improve conditioning of air
Create turbulence in air flow so air is exposed to
epithelium longer
Lamina propria is very vascular to warm blood
o Olfactory epithelium
Modified pseudostratified columnar epithelium
Contains olfactory glands and olfactory nerve
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