Respiratory System 1

Respiratory System 1

1. Function

   • Supply Oxygen Remove carbon dioxide
   • Gas exchange
   • Protection from dehydration, temperature change and pathogens
   • Production of sound
   • Olfaction

2. Respiratory system

   • Conducting portion
     • Nasal cavities
     • Nasopharynx
     • Larynx
     • Trachea
     • Bronchi
     • Bronchioles
     • Terminal bronchioles
   • Respiratory portion
     • Respiratory bronchioles
     • Alveolar ducts
     • Alveolar sacs
     • Alveoli

3. Nasal Cavities and Conchae

   • Divided medially by nasal septum -hyaline
   • PSCC epithelium (roof lined with olfactory epithelium)
   • Conchae - vascular bony shelves
   • Filter warm and incoming air

4. Nasopharynx

   • PSCC
   • Pharyngeal tonsil- adenoid (enlarged lymphatic tissue at back of nose and throat)

5. Paranasal sinuses

   • Open into nasal cavity to lighten the skull
   • Assist to moisten and warm air
   • Contain mucous cells which drain in nasal cavity
   • Frontal, ethmoidal, maxillary, sphenoidal

6. Larynx

   • Connects pharynx to trachea
   • PSCC (vocal cords and epiglottis are SSNK)
   • Phonation
   • Guard against entry of foreign bodies

7. Vocal cords

   • Glottis - space between
   • Laryngeal muscles control length and size of muscles by moving arytenoid cartillages
   • Sound produced by vibration as air exhaled