BIOLOGY
EXCELLENCE
THE RESPIRATORY SYSTEM.
All
tissues and organs need oxygen to survive. The brain demands the
most oxygen. This is a major problem for climbers who are above
5800 meters.
A low level of oxygen reaching the body tissues is called hypoxia.
At extreme altitude, most people experience a decrease in appetite,
breathlessness at rest, muscular fatigue and a falling off of
mental capacity. As climbers press on to greater heights, brain
tissue receives even less oxygen and a bizarre mental state occurs.
Now
try the sections on the respiratory system on these two sites
and complete the tests. Good luck
