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.
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