Problem
A. The partial pressure of nitrogen at the summit of Mt. McKinley is 277 mmHg on a day when the atmospheric pressure there is 350 mmHg. Assuming that the air is made up of only nitrogen and oxygen, what is the partial pressure of oxygen in mmHg at the summit?
B. A sample of 200 g of N2 at 20 oC occupies a volume of 10.0 L. Under what pressure (in atm) is this sample? (The molecular weight of N2 is 28.0 g/mol).
C. What must be the final volume (in liters) of a sample of neon if 3.0 L at 750 mmHg and 25 oC is heated to 300 oC under conditions that let the pressure change to 760 torr?
D. A square package with a mass of 50 kilograms and a base of 1 m2 sits on a table. What is the pressure (in mmHg) exerted on the table by the package?
E. A DC electromotive force of 12 volts is applied across a circuit that has a resistance of 100 ohms. What is the current flow through the circuit?
F. In order to measure pulmonary blood flow, a person breathes 100% oxygen from a spirometer. Three liters of oxygen are taken up in a period of 15 minutes. A sample of mixed venous blood from the right atrium has an oxygen concentration of 100 mL O2/L, while arterial blood has an oxygen concentration of 150 mL O2/L. Calculate the pulmonary blood flow (L/min).
G. During spontaneous inspiration, an individual develops an average pressure of inspiration of 500 Pa, and the volume of inspired air is 500 mL. Calculate the work of inspiration.
H. At rest, an individual has a cardiac output of 5 L/min and mean arterial blood pressure of 100 mm Hg. The person begins to exercise, causing cardiac output to increase to 7 L/min and mean arterial blood pressure to 120 mmHg. By approximately what percent did the power of the left ventricle increase during exercise?
I. Draw a graph representing the exponential decline in plasma drug concentration after intravenous administration of a drug. Be sure to appropriately label the axes of the graph. State an equation that can be used to describe mathematically the exponential decline in plasma drug concentration.
J. A blood vessel dilates, causing its radius to increase by 20%. If vessel length and blood viscosity remain constant, by what percent will blood flow through the vessel increase? (assume laminar flow)