What is the MOST common mechanism involved with an elbow injury?

Public health has improved the quality and life span of humans by using:

a. epidemiology. b. surveillance. c. prevention. d. all of the above.

Which of the following statements applies to a lung unit with higher resistance than normal?

a. A given volume change will require less of a pressure change. b. It will fill and empty more rapidly than a normal lung unit. c. There will be less volume change for a given pressure change. d. Volume to this area will remain the same under all conditions.