Chapter 22 Quiz

. The respiratory gas(es) is(are)

oxygen.

carbon dioxide.

nitrogen.

both oxygen and carbon dioxide.

. In diffusion, materials tend to move in net fashion from regions of

high solubility to regions of low solubility.

high chemical potential to regions of low chemical potential.

low chemical potential to regions of high chemical potential.

low partial pressure to regions of high partial pressure.

. If the partial pressures of nitrogen, argon, and CO₂ are 0.7808, 0.0093, and 0.0004 atm, respectively, in air at 1 atm, what is the partial pressure of the oxygen in this air?

0.2095%

20.95%

0.2095 atm

20.95 atm

. Consider two gas mixtures at the same temperature. If the concentration of CO₂ in Mixture A is 10 mmol/L and the concentration of CO₂ in Mixture B is 30 mmol/L, which statement is also true?

The partial pressure of CO₂ in Mixture B is 3 times as high as in Mixture A.

The partial pressure of CO₂ in Mixture B is 3 times lower compared to Mixture A.

The percent of CO₂ in Mixture B is 3 times as high as in Mixture A.

The percent of CO₂ is the same in both mixtures.

. _______ is the law that relates partial pressure and concentration in aqueous solutions.

The universal gas law

The partial pressure law

Henry's law

Krogh's law

. What is the relationship between temperature and the solubility of gases in aqueous solutions?

The solubility of gases in aqueous solution has an exponential relationship to temperature.

As temperature increases, the solubility of gases in aqueous solutions increases.

As temperature increases, the solubility of gases in aqueous solutions decreases.

The solubility of a gas in an aqueous solution is directly proportional to temperature.

. Gases diffuse in net fashion from areas of relatively high partial pressure to areas of relatively low partial pressure

within gas mixtures.

within aqueous solutions.

across gas–water interfaces.

in all combinations of gas–aqueous phases.

. Which statement regarding the water beetle is true?

As oxygen in the bubble is used up, oxygen diffuses from the water into the bubble.

As CO₂ in the bubble increases, it causes oxygen to enter the bubble more readily.

As the beetle dives, the increase in pressure drives oxygen into the beetle.

The nitrogen in the bubble is responsible for maintaining the oxygen concentration.

. During gas diffusion, as the distance between P₁ and P₂ increases, the

rate of net movement decreases.

rate of net movement increases.

rate of net movement does not change.

diffusion coefficient increases.

. Which statement regarding gas diffusion is true?

Gases diffuse only slightly faster through the gas phase than through aqueous solutions.

Gases diffuse many times faster through the gas phase than through aqueous solutions.

Gases diffuse at equal rates through the gas phase and aqueous solutions.

Gases diffuse only slightly slower through the gas phase than through aqueous solutions.

. Oxygen that is bound to hemoglobin

does not contribute to the oxygen partial pressure.

contributes the same amount to partial pressure as when it is dissolved in solution.

contributes more to partial pressure than when it is dissolved in solution.

increases the partial pressure of CO₂.

. As a gas mixture or an aqueous solution flows, gas molecules in the gas or liquid are carried from place to place by

tidal flow.

diffusion.

evaporation.

convection.

. Movement of air into and out of a human lung is an example of

diffusion.

Henry's law.

unidirectional flow.

tidal flow.

. Oxygen transport in animals occurs by

diffusion.

convection.

active transport.

both convection and diffusion.

. In oxygen transport to the mitochondria, diffusion occurs from

the mouth to the lungs.

the lungs to the red blood cells.

the red blood cells to the mitochondria.

both the lungs to the red blood cells and the red blood cells to the mitochondria.

. Which O₂ partial pressure value would you expect to find in the ambient air (AA), arterial blood (AB), and systemic capillary blood (SCB) of an animal?

AA = 150 mm Hg; AB = 100 mm Hg; SCB = 70 mm Hg

AA = 150 mm Hg; AB = 70 mm Hg; SCB = 100 mm Hg

AA = 70 mm Hg; AB = 100 mm Hg; SCB = 70 mm Hg

AA = 70 mm Hg; AB = 100 mm Hg; SCB = 150 mm Hg

. At standard conditions of temperature and pressure (STP),

1 mg of gas occupies 22.4 L.

1 mole of gas occupies 22.4 L.

22.4 moles of gas occupies 1 L.

22.4 grams of gas occupies 1 L.

. Which statement regarding air and water is false?

Water is more viscous than air.

Air-breathing animals generally expend more energy ventilating than water-breathing animals.

Per unit volume, water holds less oxygen than air.

Temperature affects the oxygen solubility in water more than it does in air.

. If the percentage of oxygen in air at sea level is 20.95%, what is the percentage of oxygen in air at the top of Mount Everest?

Significantly higher than 20.95%

The same—20.95%

Significantly lower than 20.95%

Negligible—close to 0%

. Which organisms use CO₂ during the day?

Fungi

Animals

Plants

Bacteria

Chapter 22 Quiz

Quiz Content