21.5 Gas Transport Through the Blood Flashcards
About ______ of oxygen in blood is transported on hemoglobin (Hb).
About 98.5% of oxygen in blood is transported on hemoglobin (Hb).
The ability of Hb to load or unload oxygen depends on the ________ in the lungs or tissues and the ________ of Hb for _________.
The ability of Hb to load or unload oxygen depends on the Po2Po2 (partial pressure of oxygen) in the lungs or tissues and the affinity of Hb for oxygen.
The oxygen-hemoglobin dissociation curve shows the relationship between what?
The oxygen-hemoglobin dissociation curve shows the relationship between the:
percent saturation of Hb and the partial pressure of oxygen
____________ in temperature, hydrogen ion concentration, Pco2Pco2, and BPG facilitate the unloading of oxygen from Hb.
Increases in temperature, hydrogen ion concentration, Pco2Pco2, and BPG facilitate the unloading of oxygen from Hb.
Some carbon dioxide dissolves in plasma (7–10%) and binds to Hb (20%); most is converted to _________(70%) in a reaction catalyzed by the enzyme __________.
Some carbon dioxide dissolves in plasma (7–10%) and binds to Hb (20%); most is converted to bicarbonate ions (70%) in a reaction catalyzed by the enzyme carbonic anhydrase.
Increases in what facilitate the unloading of oxygen from Hb?
Increases in
- temperature,
- hydrogen ion concentration,
- Pco2Pco2,
- and BPG
facilitate the unloading of oxygen from Hb.
How is most oxygen transported in the blood?
- A. as the bicarbonate ion in the plasma
- B. as carbonic acid in the plasma
- C. combined with hemoglobin as carbaminohemoglobin
- D. bound to hemoglobin as oxyhemoglobin
How is most oxygen transported in the blood?
Answer: D. bound to hemoglobin as oxyhemoglobin
The majority of carbon dioxide is transported __________.
A. as carbaminohemoglobin
B. dissolved in plasma
C. as carbonic acid
D. as the bicarbonate ion
The majority of carbon dioxide is transported __________.
Answer: D. as the bicarbonate ion
Respiratory acidosis results from __________.
A. hypocapnia
B. hypoxia
C. hyperventilation
D. hypoventilation
Respiratory acidosis results from __________.
Answer: D. hypoventilation
One of the primary buffer systems in the body is the ________-________ buffer system.
carbonic acid–bicarbonate buffer system.
the carbonic acid–bicarbonate buffer system
__________ Pco2Pco2, as occurs with __________, causes respiratory acidosis.
Increasing Pco2Pco2, as occurs with hypoventilation, causes respiratory acidosis.
_________________, as occurs with _________________, causes respiratory alkalosis.
Decreasing Pco2Pco2, as occurs with hyperventilation, causes respiratory alkalosis.
Carbon dioxide and water combine to form __________.
carbaminohemoglobin
nitric acid
hydrochloric acid
carbonic acid
Carbon dioxide and water combine to form __________.
D. carbonic acid
A fully saturated hemoglobin molecule transports __________.
1 molecule of oxygen
2 molecules of oxygen
4 molecules of oxygen
8 molecules of oxygen
A fully saturated hemoglobin molecule transports __________.
C. 4 molecules of oxygen
The affinity of hemoglobin for oxygen increases with __________.
slower metabolic rate
increased hydrogen ion concentration
increased partial pressure of carbon dioxide
increased body temperature
The affinity of hemoglobin for oxygen increases with __________.
A. slower metabolic rate
