ch 24 Flashcards
Which statement about hemoglobin is false?
a. It plays a role in CO2 transport.
b. It plays a role as a pH buffer.
c. It plays a role in N2 transport.
d. It is affected by temperature.
c
Which statement comparing human adult and fetal hemoglobin is true?
a. Fetal hemoglobin contains one particular subunit that lowers its P50.
b. Fetal hemoglobin contains one particular subunit that raises its P50.
c. All subunits of fetal hemoglobin are different and result in a lower P50.
d. All subunits of fetal hemoglobin are different and result in a higher P
a
Which statement about myoglobin is true?
a. It is a respiratory pigment found in the red blood cell.
b. It is exactly like hemoglobin but is found in a different location in the bod
c. It is a type of fetal hemoglobin.
d. It is a respiratory pigment found in muscle cytoplasm
d
The image on a graph showing the functional relationship between the percentage of
oxygenated binding sites and the O2 partial pressure is best known as
a. the saturation curve.
b. the affinity curve.
c. the P50 curve.
d. the oxygen dissociation curve
d
A respiratory pigment that requires a relatively low O2 partial pressure for loading has \_\_\_\_\_\_\_ affinity for O2. a. a low b. a high c. no d. a variable
b
In a healthy human at rest, what is the approximate O2 saturation of venous blood as it is leaving the tissues? a. 75% b. 50% c. 25% d. 0%
a
A respiratory pigment that requires a relatively low O2 partial pressure for loading
and has a high affinity for O2 would also have
a. a relatively low P50.
b. a relatively high P50.
c. no P50 at all.
d. a variable P50
a
The effect of acid in reducing the affinity of hemoglobin for O2 is called the \_\_\_\_\_\_\_ effect. a. Haldane b. dissociation c. Root d. Bohr
d
Which statement is not directly related to the Bohr effect?
a. The Hb‒O2 affinity increases as pH increases.
b. The Hb‒O2 affinity decreases as temperature increases.
c. The Hb‒O2 affinity decreases as CO2 partial pressure increases.
d. The Hb‒O2 affinity decreases as H+
concentration increases.
b
The affinity of hemoglobin for O2 increases with a. decreasing temperature. b. decreasing blood pH. c. an increase in CO2 partial pressure. d. increasing [H+ ].
a
The venous blood displays a reduced O2 affinity compared to arterial blood because its a. CO2 partial pressure is higher. b. H+ concentration is higher. c. hemoglobin concentration is lower. d. CO2 partial pressure is higher and its H+ concentration is higher.
d
During chronic exposure to high altitude, increasing 2,3-DPG
a. increases Hb‒O2 affinity.
b. increases the unloading of O2 at tissues.
c. increases the loading of O2 at the lungs.
d. decreases the P50 of hemoglobin
b
Which statement about respiratory pigments is false?
a. They serve as major buffers of blood pH.
b. They play critical roles in CO2 transport.
c. They play critical roles in the transport of nutrients.
d. They can function as O2 stores in invertebrates.
c
An octopus meets the increased demand for O2 at the tissues during intense exercise
by
a. increasing its circulation rate.
b. pulling more O2 from the blood (from its venous reserve).
c. switching to another form of hemoglobin.
d. increasing its circulation rate and pulling more O2 from the blood (from its venous
reserve).
a
The P50 in a fish species adapted to a low oxygen aquatic environment would likely
be _______ the P50 of a fish species adapted to a well-oxygenated aquatic environment.
a. higher than
b. equal to
c. lower than
d. extremely variable compared to
c
The exposure of Daphnia to O2-poor water for days would result in
a. an increase in hemoglobin concentration.
b. a change in the globin subunits produced.
c. an increase in hemoglobin concentration and a decrease in the P50 of the blood.
d. an increase in hemoglobin concentration, a decrease in the P50 of the blood, and a
change in the globin subunits produced
d
Antarctic icefish compensate for the lack of circulating red blood cells with
a. an increase in the amount of hemoglobin in their plasma.
b. the use of another type of respiratory pigment.
c. an increased circulation rate.
d. a lowering of their metabolic rate, along with general inactivity.
c
In many cases, lowland people who travel to an area of high altitude for an extended
period of time will develop a condition known as
a. polycythemia.
b. anemia.
c. bradycardia.
d. hypotension.
a
The extent of bicarbonate formation in the blood depends primarily on the
a. solubility of bicarbonate in the plasma.
b. temperature.
c. blood buffers.
d. solubility of carbonic acid.
c
