1. An oxygen equilibrium curve shows_______. Select one:

a. the relationship between hematocrit and the percentage of
oxygenated respiratory pigment in blood.

b. the relationship between the partial pressure of oxygen in
the plasma and the percentage of alveoli full of air.

c. the relationship between the partial pressure of oxygen in
the plasma and blood pressure.

d. the relationship between the partial pressure of oxygen in
the plasma and the percentage of oxygenated respiratory pigment in
a volume of blood.

2. In organisms that have high metabolic rates, the gas exchange
surfaces within these organisms have: Select one:

a. Decreased diffusion distances and total respiratory surface
area.

b. Decreased diffusion distances and increasing total
respiratory surface area.

c. Increased diffusion distances and decreasing total
respiratory surface area.

d. Increased diffusion distances and total respiratory surface
area.

3. What is an advantage of excreting uric acid vs. ammonia?
Select one:

a. The low pH of uric acid is more tolerable than the high pH of
ammonia.

b. Uric acid is not as toxic as ammonia, and can therefore
accumulate in the body fluids.

c. Uric acid is excreted as a fluid, which requires less energy
than storage of ammonia crystals.

d. Uric acid synthesis requires less energy than ammonia
synthesis.