PHGY 210 Lecture Notes - Lecture 6: Pulmonary Artery, Endothelium, Heart
Jan 16, 2017
Respiration
Structure of Lungs and Chest Wall
-primary function of respiration: gas exchange
-inspiration: air rich in O2 is inhaled into lungs
-expiration: CO2 produced during oxidative processes of body is exhaled from lungs
-both gases are transported by blood
-thus, both cardiovascular system and respiratory system are involved
Respiratory Tract
-air goes in through nose and hits nasal turbinates
-small sections
-will catch particles
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-then pharynx
-then larynx
-site of vocal cords
-splits into right and left main bronchi
-each split into smaller bronchi
-right: splits into 3 lobar bronchi
-each goes toward a lobe
-left: splits into 2 lobar bronchi
-left side only has 2 lobes (humans)
-eventually gets to alveoli
-region of gas exchange
-balloon-like structures surrounded by blood-capillaries
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Document Summary
Inspiration: air rich in o2 is inhaled into lungs. Expiration: co2 produced during oxidative processes of body is exhaled from lungs. Thus, both cardiovascular system and respiratory system are involved. Air goes in through nose and hits nasal turbinates. People put in a substance that hardens when dry so they could see the alveolar tree. Contains nothing but a very small amount of fluid. As chest is pulled open, it also pulls the lungs open. So air will go down its pressure gradient and will go in. Way to visualize apposition of two pleural surfaces is to put drop of water b/w two glass microscope slides. Two slides can easily slide over each other, but are very difficult to pull apart. What happens if you have an accident and something goes through your chest (not lungs, just through rib cage) When not breathing but nose/mouth are open: pressure inside lungs is the same.
