Re: What are the parts and functions of a respiratory system?

The parts of the respiratory system are:  the nasal cavity, the mouth, 
larynx, pharynx, trachea, bronchial tubes, lungs, and diaphragm.

The respiratory system is responsible for the exchange of oxygen and carbon 
dioxide.  It supplies oxygen to the blood and gets rid of carbon dioxide 
and other waste gases.

"The respiratory system provides oxygen from the air for cells to change 
food into energy.  Air enters your lungs when you inhale.  You breathe by 
lifting your ribs and contracting your diaphragm.  The diaphragm is a sheet 
of muscles across the bottom of the chest cavity.  Air passes through your 
nose.  It passes from the back of the nose and mouth to the trachea.  The 
trachea is a tube that leads into the chest cavity and divides to form the 
bronchial tubes.  Most of the time the trachea is open and air passes 
freely in and out of the lungs.  But when we swallow, a flap of cartilage, 
called the epiglottis, closes over the trachea so that food can't enter.  
Humans inhale oxygen and exhale carbon dioxide.  The organ where this 
exchange of gases takes place is called the alveoli membranes."

This information was found on the Internet at http://www.aj.com.  Once you 
go to this site, you can ask any question that you want to ask.  I typed in 
the following question:  "Where can I find information about the 
respiratory system in the human body?"  The site then provides many links 
to other great sites where information on and diagrams of the respiratory 
system can be found.