Textbook QuestionWhich of the following determines the direction of gas movement? a. solubility in water, b. partial pressure gradient, c. temperature, d. molecular weight and size of the gas molecule.188views
Multiple ChoiceWhen determining the directions that molecules will move in external and internal respiration:76views1rank
Textbook QuestionHenry's law states that the degree to which a gas dissolves in a liquid is determined by its:a. partial pressure.b. solubility.c. surface tension.d. Both a and b are correct.e. All of the above are correct.133views
Multiple ChoiceHenry's law states that the total pressure exerted by a mixture of gases is the sum of the pressures exerted independently by each gas in the mixture.1236views
Textbook QuestionYou and a friend are having a contest to see who can hold his or her breath the longest. Your friend hyperventilates before holding his breath, and subsequently wins the contest. Why did hyperventilation give him an advantage?138views
Multiple ChoiceHenry's law states that when a gas is in contact with a liquid, that gas will dissolve in the liquid in proportion to its partial pressure.1398views4rank
Textbook QuestionWhat is the significance of (b) Dalton's law, to the process of respiration?148views
Textbook QuestionFill in the blanks: When the alveolar Po₂ decreases, the pulmonary arterioles_____. When the arteriolar Pco₂ increases, the bronchioles_______.122views
Textbook QuestionWhich of the following does not occur in internal respiration? (a) Oxygen diffuses from the blood to the interstitial spaces. (b) Carbon dioxide diffuses from the interstitial spaces to the blood. (c) Hemoglobin binds more oxygen. (d) Bicarbonate ions are formed in red blood cells. (e) Chloride ions diffuse into red blood cells as bicarbonate ions diffuse out.166views
Textbook QuestionGas exchange at the blood air barrier is efficient because (a) the differences in partial pressure are substantial, (b) the gases are lipid soluble, (c) the total surface area is large, (d) of all of these.171views
Textbook QuestionOxygen and carbon dioxide are exchanged in the lungs and through all cell membranes by a. active transport, b. diffusion, c. filtration, d. osmosis.199views
Textbook QuestionDoris has an obstruction of her right primary bronchus. As a result, how would the oxygen–hemoglobin saturation curve for her right lung compare with that for her left?171views
Multiple ChoiceFor internal respiration, which of the following must be true:I. The total amount of CO2 exchanged equals the amount of O2 exchanged.II. Carbon dioxide will move down its concentration gradient to enter the blood.III. The partial pressure of O2 in the tissue before gas exchange is ≥ 40 mm Hg.69views1rank
Textbook QuestionWhat is it about the structure of the alveoli that makes them an ideal site for gas exchange?269views
Multiple ChoiceWhat is one difference between air in the alveoli compared to air in the atmosphere?73views1rank
Multiple ChoiceWhich gradient most directly determines the direction that oxygen and carbon dioxide molecules will move between the air in the alveoli and the blood:76views1rank
Textbook QuestionWhy do individuals who are anemic generally not exhibit an increase in respiratory rate or tidal volume, even though their blood is not carrying enough oxygen?249views
Textbook QuestionWhat happens to the process of respiration when a person is sneezing or coughing?162views
Multiple ChoiceWhat is the approximate partial pressure of oxygen in the blood as it enters and leaves the capillaries of the alveoli?72views1rank