PSL301H1 Lecture Notes - Brainstem, Village Accountant, Shortness Of Breath
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PSL301H1 Full Course Notes
Verified Note
41 documents
Document Summary
Respiratory system: overview of function and structure. John 20 year old university student has asthma. Condition usually controlled with medication, he occasionally has asthma attacks. Exchange of gases between air and blood. Regulation of body ph. Defense from inhaled pathogens/foreign particles. Upper respiratory tract: pharynx, vocal cords, esophagus, nasal cavity, tongue, larynx. Lower respiratory tract: right lung, right bronchus, left lung, left bronchus, diaphragm. Muscles of inspiration: sternocleidomastoids, scalenes, external intercostal, diaphragm. Muscles of expiration: internal intercostal, abdominal muscle. Larynx > trachea > left primary bronchus > secondary bronchus > bronchiole > alveoli. Trachea branches into two primary bronchi. Primary bronchus divides 22 more times terminating in a cluster of alveoli. Warm air to 37 c. Filter (nose and respiratory cilia) Filtering action of cilia that line airways. Cilia move mucus to pharynx. Mucus layer traps inhaled particles. Watery saline layer allows cilia to push mucus toward pharynx. Goblet cells secretes mucus.
