BIO 202-assignment 3
What is the result of inspiration?
An increased alveolar volume causes decreased alveolar pressure.
Which of the following is an application of Boyle's Law?
At a constant temperature, as the volume of a gas increases, the pressure decreases.
What does Boyle's law state?
At a constant temperature, the pressure exerted by a gas varies inversely with the volume of that gas.
At the arterial end of a tissue capillary, rank the following structures from highest to lowest Po2.
Capillaries, tissue fluid, cells
Which of the following occurs during expiration?
Decreased alveolar volume causes increased alveolar pressure.
As the lungs expand while breathing, the pressure in the lungs decreases.
true
At the venous end of tissue capillaries, there is no net movement of O2 and CO2.
true
Gases diffuse because of differences in partial pressures from areas of higher pressure to areas of lower pressure.
true
How can Boyle's law be represented?
P1V1 = P2V2
What is the outermost layer of the pleural membrane?
Parietal pleura
What is the fluid filled area between the pleural layers called?
Pleural cavity
Which of the following statements about partial pressures of gases in the tissues is true?
Po2 in blood > Po2 in tissues; Pco2 in blood < Pco2 in tissues
Which of the following statements about partial pressures of gases in the lungs is true?
Po2 in the lungs > Po2 in the blood; Pco2 in the lungs < Pco2 in the blood
Which of the following is true at the venous ends of the pulmonary capillaries?
The Pco2 is equal in the capillaries and in the alveoli.
Which of the following is true at the arterial ends of the pulmonary capillaries?
The Po2 is lower in the capillaries than in the alveoli.
What determines the direction of gas movement?
The partial pressure differences
Oxygen-rich blood is carried through pulmonary arteries from the lungs to the heart.
false
The alveoli never attain equal pressure with the ambient (outside) air.
false
The pleural membranes function like a fluid filled balloon that completely surrounds the heart.
false
Inspiration begins as __________.
the diaphragm contracts
As a volume of a gas increases, the number of molecules of that gas that collide with the walls of the container decreases.
true
If the volume of the alveoli increased, the pressure would decrease.
true
Oxygen-poor blood is carried through systemic veins from the body tissues back to the heart.
true
The partial pressure of a gas is measured in millimeters of mercury.
true
When partial pressures for a given gas are equal between the capillaries and the tissue fluids, no net movement of that gas occurs.
true
What is the layer of the pleural membrane that is attached to the surface of the lung?
visceral pleura
