Discussion: Cabin Altitude and Pressurization

 There are two parts to this discussion:
APA with references

Part One:
As  alluded to in the Module Preview, aircraft pressurization systems are  critical component in the world of flight physiology. With this in mind,  compare and contrast two different types of aircraft pressurization  systems. Discuss the key components and how a failure of any of these  components could result in a physiological insult to an aviator.

Part Two:
Your  next set of discussion questions examines a byproduct of aircraft  pressurization - cabin altitude. What is cabin altitude? Why is it  important in flight physiology? What is the typical cabin altitude of a  commercial airliner? Does this altitude typically pose a problem to the  passenger?