An adult human at rest inhales and exhales approximately 500 ml of air (called the tidal volume) in approximately 5 sec. However, at the end of each exhalation, the lungs still contain a volume of air, called the functional residual capacity (FRC), which is approximately 2000 ml. a. What volume of air is in the lungs after inhalation?

b. What volume of air is in the lungs after exhalation?

c. What is the period of a complete respiratory cycle?

d. Write a function V(t)=AcosBt+D to represent the volume of air in the lungs t seconds after the end of inhalation.

e. What is the average amount of air in the lungs during one breathing cycle?