PHYS20008 Lecture Notes - Lecture 32: Exhalation, Intrapleural Pressure, Cellular Respiration

• School: University of Melbourne
• Department: Physiology
• Course: PHYS20008
• Professor: Charles Sevigny

Document Summary

* ventilation or breathing: exchange of air between atmosphere (exchange of gases with the environment) and lungs. * exchange of o2 & co2 between lungs and blood. * transport of o2 & co2 by blood. * exchange of o2 & co2 between blood & cells. * intracellular reaction of o2 with nutrients to produce co2, water and energy (metabolism) Carbon dioxide regulates ventilation because we need to maintain ph within a narrow range. * provides additional route for water loss and heat elimination (although not effective in humans) this is a side effe(cid:272)t, hu(cid:373)a(cid:374)"s do(cid:374)"t reall(cid:455) lose heat (it o(cid:272)(cid:272)urs more for dogs when they pant) * e(cid:374)ha(cid:374)(cid:272)es ve(cid:374)ous retur(cid:374) via (cid:862)respirator(cid:455) pu(cid:373)p(cid:863) as the pressure changes in the thorax that enhances rhythmically the ability of venous return. * pleural sac which attaches the lung to the thoracic wall the lungs are not attached to the thoracic wall. * pressure differences between the atmosphere, lungs and pleural sac.