The document discusses the respiratory system, including its main parts like the nasal cavity, trachea, lungs and diaphragm. It describes the respiratory system's functions of bringing oxygen into the body and removing carbon dioxide. Gas exchange occurs through diffusion across the alveoli and capillaries in the lungs. Inhalation is driven by the diaphragm contracting to decrease pressure and draw air in, while exhalation happens as the diaphragm relaxes and pressure increases to push air out.
5. (3) Respiratory Function
• Bring oxygen into the body.
• Expel carbon dioxide from the body.
• Work with the Cardiovascular System to
circulate oxygen and carbon dioxide to their
appropriate locations.
6. (4) Gas Exchange
• The alveoli are covered in tiny blood vessels
called capillaries.
• The gases naturally diffuse HIGH to LOW
concentration across the tissue walls:
– Oxygen moves from the alveoli, into the
capillaries and blood stream.
– Carbon dioxide moves from the blood stream,
into the alveoli and out of the body.
7.
8. (5) Inhalation
• Diaphragm contracts (pulls down).
• Volume of lungs increases, causing a huge
drop in pressure.
• Gas outside the body rushes into the lungs.
9.
10. (6) Exhalation
• Diaphragm relaxes (punches up).
• Volume of lungs decreases, causing huge
increase in pressure.
• Gas inside body rushes out of lungs.
