Gas Exchange at a Cellular
Level
By Holly2 and Aaron
O2 and CO2 in Blood
 Oxygen is carried by hemoglobin.
 Dissolved in the plasma.
Amount of Oxygen Carried
2%
Hemoglobin
Plasma
98%
Respiration
 Process of delivering O2 to cells and
carrying away CO2.
 Includes:
 gas exchange in lungs
 circulation of gases through
bloodstream
 transfer of gases at cellular
level
http://www.biology.arizona.edu/chh/problem_sets/lung_toxicology/graphics/gas_exchange.gif
Breathing Anatomy and Gas
Exchange
http://www.teachertube.com/view_video.php?viewkey=f0710c16983b9eab5364
Respiration Process
 air goes into lung sacs
 O2 from the air enters





the blood
CO2 exits from the
blood into the air
blood reaches the
tissues
O2 diffuses into cells
CO2 enters the blood
blood circulates back to
the lungs
http://catalog.nucleusinc.com/imagescooked/2672W.jpg
HowStuffWorks Gas Exchange
"Gas Exchange." 17 February 2005. HowStuffWorks.com.
<http://health.howstuffworks.com/adam-200022.htm> 28 October 2008.
Path of O2 and CO2
 Partial Pressure is exerted by a
certain gas among a mixture of
other gasses.
 Partial pressure is a measure of
how much of that gas is
present in a mixture.
 Gas diffuses in the direction
with the least the partial
pressure.
 Simple Diffusion - Oxygen
diffuses through the membrane
and plasma, and is taken up by
the RBC (Red Blood Cells.)
http://kentsimmons.uwinnipeg.ca/cm1504/Image
132.gif
Magic School Bus – Works Out
http://www.youtube.com/v/rxUAECHuGoQ&hl=en&fs=1&rel=0&start=240
Hindrances to gas exchange
 When a blood vessel is
damaged a clot forms.
 Clotting can prevent
gas exchange.
 A lack of hemoglobin
can hinder cellular
respiration.
 Hemophilia is caused
by a lack of
hemoglobin
http://media-2.web.britannica.com/eb-media/28/98328-004-5514AFAC.jpg
Blood Clotting
Collagen fibers
Platelet releases chemicals
that make nearby platelets sticky
Platelet
plug
Clotting factors from:
Platelets
Damaged cells
Plasma (factors include calcium, vitamin K)
Prothrombin
Thrombin
Fibrinogen
Fibrin
Fibrin clot
Red blood cell
Bibliography
 Argyle, B. "Physiology of Gas Exchange." Blood Gas Text. 1996.





Mad Scientist Software. 27 Oct. 2008.
Rice, Daniel. "Gas Exchange In Humans." The Biology 2201. 27
Oct. 2008 <http://www.cdli.ca/~dpower/resp/exchange.htm>.
Ritchison, Gary. Human Physiology - Respiration. 27 Oct. 2008
<http://people.eku.edu/ritchisong/ritchiso//301notes6.htm>.
Starr, Cecie, and Ralph Taggart. Biology : The Unity and
Diversity of Life. Belmont: Brooks/Cole, 2003.
"Gas Exchange." 17 February 2005. HowStuffWorks.com.
<http://health.howstuffworks.com/adam-200022.htm> 28
October 2008.
http://www.skanschools.org/HS/library/Norris/ch.42%20notes.
ppt