BIOM 3200 Lecture Notes - Lecture 11: Alveolar Cells, Bronchiole, Alveolar Pressure

58 views12 pages

Document Summary

Lungs are large organs of respiration located in chest cavity. Respiratory & conducting zones: conducting zone consists of structures thru which air passes before it reaches respiratory zone, respiratory zone is where air exchange occurs. Lungs of mammals are elastic, multi- chambered bags, which open to exterior thru trachea. Increase in thoracic volume reduces alveolar pressure & air is drawn into lungs: during exhalation, diaphragm & external intercostal muscles relax, reducing thoracic volume, reduced thoracic volume = increase in alveolar pressure & forces air out of lungs. Lungs normally fill thoracic cavity so that visceral pleura covering each lung is pushed against parietal pleura lining the thoracic wall: thus little or no air between vis(cid:272)e(cid:396)al & pa(cid:396)ietal pleu(cid:396)a, ho(cid:449)e(cid:448)e(cid:396) the(cid:396)e"s intrapleural space. Intrapleural space would become a real space, if the visceral & parietal pleurae separate when lung collapses. Intrapulmonary & intrapleral pressures: air enters lung during inspiration because atmospheric pressure > intrapulmonary/intra-alveolar pressure.

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related Documents

Related Questions