1. An oxygen equilibrium curve shows_______. Select one: a. the relationship bet
ID: 85307 • Letter: 1
Question
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.
Explanation / Answer
Q1:d. the relationship between the partial pressure of oxygen in the plasma and the percentage of oxygenated respiratory pigment in a volume of blood.
This curve is also known as oxygen-hemoglobin dissociation curve, the curve relates the percentage saturation of the oxygen carrying power of hemoglobin to the pO2.It has a characteristic sigmoid shape.
Q3.b. Uric acid is not as toxic as ammonia, and can therefore accumulate in the body fluids.
EXPLAINATION; Though the uric acid synthesis requires more energy than ammonium formation but it is less toxic than ammonium and even if retained in the body does not cause as harmful effects as ammonia does.This mechanism has evolved in birds and reptiles.Since it is less toxic it decreases water loss from the body and thus reduces subsequent demand for water.
2. OPTION B.Decreased diffusion distances and increasing total respiratory surface area.
Short diffusion distances provide an efficient means of exchanging gases, since gases are continously produced and further it is strgthened by large surface area to volume ratio.
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