VIBS 305 Lecture Notes - Lecture 8: Thoracic Cavity, Pleural Cavity, Intercostal Muscle
20 Dec 2017
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Document Summary
Upper (conducting) modi cation of air - nasal cavity cilia & goblet cells (pseudostrati ed calumnar) Lter warm moisturize before going to the lungs blood vessels counter-current system mucous. Olfaction - chemoreceptors - nasal cavity olfactory epithelium olfactory neurons. Carried to the olfactory bulb then to the cranial nerve 1. Oxygen and carbon dioxide exchange ph balance of blood. Larynx (musculocartilaginous organ) responsible for phonation (speaking) maintains an open airway produces sound - vocalis muscles prevents swallowed food and water from entering airway (protection of lungs) C shaped hyaline cartilage incomplete on posterior or dorsal side - completed by trachialis muscle (smooth muscle) smooth muscle prevent collpase of airway coughing and swallowing helps with the passage of food. Bronchi (2) - principal & lobar split into two smaller branches = bronchioles (have no cartilage) Alveoli and alveolar ducts responsible for the gas exchange. Type 2 produce surfactant prevents collapse and reduces surface tension.
