gas exchange in the human body by max mar 8c science mrs. hennard
TRANSCRIPT
Gas Exchange in the Human Body
By Max Mar 8C Science Mrs. Hennard
The Start of the Gas Exchange
INHALING
The start of the gas exchange
is inhaling. This is when you
breathe in through your
mouth or nose.
When the air is breathed in
through the mouth it travels
down the trachea to the bronchi.
In the Lungs
After reaching the bronchi, the air is split between the two lungs. Then the air flows in to the lungs and enters the bronchiles, then is split between the alveoli…
What are the Alveoli
The air travels to the bronchioles.
It is then spread to the Alveoli are small sacks in the lungs that have blood cells running through them. Alveoli are named after the Latin word for ‘grapes’
Inside the Alveoli
Inside the Alveoli is where the gas is exchanged. The oxygenated air enters the alveoli from the lungs and the oxygen travels through a one-cell thick wall of the capillaries to the veins and is then taken to the heart, oxygenated.
Inside the Alveoli Cont.
Then the left over carbon dioxide (CO2) is transported out of the alveoli and taken back out of the lungs. Then it is exhaled and more air is inhaled and the hole process starts again
The Air we Breathe
The air we breathe is made up of 4 main gases
Approximately 78% Nitrogen
Approximately 20% Oxygen
Approximately 1% Argon
<1% Carbon Dioxide
<1% A combination of numerous other gases
Bibliography
"Lungs Renovated in Lab." Discovery News. N.p., n.d. Web. 5 Oct. 2012. <http://news.discovery.com/tech/lungs-reseeding-transplant.html>.
"Alveoli." Alveoli. N.p., n.d. Web. 7 Oct. 2012. <http://oac.med.jhmi.edu/res_phys/Encyclopedia/Alveoli/Alveoli.HTML>.
"The Respiratory System." : Gas Exchange. N.p., n.d. Web. 9 Oct. 2012. <http://christylearningcentre.blogspot.com/2010/11/gas-exchange.html>.
"The Trachea and Bronchi." - Gray's Anatomy of the Human Body. N.p., n.d. Web. 9 Oct. 2012. <http://education.yahoo.com/reference/gray/subjects/subject/237>.