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WorksheetsRespiratory System 4
Total questions: 26
Worksheet time: 13mins
How is molecular 02 carried in the blood?
98.5% is dissolved in plasma and 1.5% is bound to hemoglobin.
1.5% is dissolved in plasma and 98.5% is bound to hemoglobin.
It is equally distributed between plasma and hemoglobin.
It is only carried by plasma.
How many 02 molecules can each hemoglobin (Hb) in RBCs carry?
Each Hb can carry 1 02 molecule.
Each Hb can carry 2 02 molecules.
Each Hb can carry 3 02 molecules.
Each Hb can carry 4 02 molecules.
Approximately how many 02 molecules can one red blood cell carry?
One red blood cell can carry ~1 million 02 molecules.
One red blood cell can carry ~1 thousand O2 molecules.
One red blood cell can carry ~1 billion 02 molecules.
One red blood cell can carry ~1 trillion 02 molecules.
What happens to the shape of hemoglobin (Hb) during the loading and unloading of O2?
The shape of Hb remains constant.
The shape of Hb changes randomly.
The shape of Hb changes to facilitate the loading and unloading of 02.
The shape of Hb changes only during the loading of 02.
How does the affinity of Hb for 02 change as O2 binds and is released?
As O2 binds, Hb affinity for 02 decreases; as O2 is released, Hb affinity for 02 increases.
As 02 binds, Hb affinity for O2 increases; as O2 is released, Hb affinity for 02 decreases.
The affinity of Hb for O2 remains constant regardless of whether 02 is binding or being released.
The affinity of Hb for O2 is not related to the binding or release of 02.
When is Hb considered fully saturated with respect to O2?
When one heme group carries 02.
When two heme groups carry 02.
When three heme groups carry 02.
When all four heme groups carry 02.
What percentage of bound oxygen is typically unloaded during one systemic circulation?
10-15%
30-35%
40-45%
20-25%
What happens when oxygen levels in tissues drop?
Less oxygen dissociates from hemoglobin and is used by cells.
Respiratory rate or cardiac output increases.
More oxygen dissociates from hemoglobin and is used by cells.
Oxygen stops dissociating from hemoglobin.
If oxygen levels in tissues drop, what happens to the respiratory rate or cardiac output?
How is the rate of loading and unloading of O2 regulated?
It is regulated to ensure minimal oxygen delivery to cells.
It is regulated to ensure maximum oxygen delivery to cells.
It is regulated to ensure adequate oxygen delivery to cells.
It is not regulated and occurs randomly.
What happens to the unloading of O2 as the Po2 decreases?
Unloading decreases.
Unloading remains constant.
Unloading increases.
Unloading stops completely.
How does an increase in temperature affect the unloading of O2?
Unloading decreases.
Unloading remains constant.
Unloading increases.
Unloading stops completely.
What effect does a decrease in blood pH have on the unloading of O2?
Unloading decreases.
Unloading remains constant.
Unloading increases.
Unloading stops completely.
How does an increase in Pco2 affect the unloading of O2?
Unloading decreases.
Unloading remains constant.
Unloading increases.
Unloading stops completely.
What is hypoxia?
Excessive 02 delivery to tissues.
Inadequate 02 delivery to tissues.
Normal 02 delivery to tissues.
Fluctuating O2 delivery to tissues.
What is anemic hypoxia?
It is caused by impaired or blocked circulation.
It is caused by cells being unable to use 02.
It is caused by abnormal ventilation or pulmonary disease.
It is caused by too few RBCs or abnormal or too little Hb.
What is ischemic hypoxia?
It is caused by too few RBCs or abnormal or too little Hb.
It is caused by impaired or blocked circulation.
It is caused by cells being unable to use 02.
It is caused by abnormal ventilation or pulmonary disease.
What is histotoxic hypoxia?
What is hypoxemic hypoxia?
What causes carbon monoxide poisoning?
What role does nitric oxide (NO) play in the body?
It is caused by too few RBCs or abnormal or too little Hb.
NO is a vasoconstrictor that plays a role in blood pressure regulation.
NO is a vasodilator that plays a role in blood pressure regulation.
NO is a vasodilator that plays a role in heart rate regulation.
What is the relationship between hemoglobin and nitric oxide?
Hemoglobin is a vasodilator and a nitric oxide producer.
Hemoglobin is a vasoconstrictor and a nitric oxide scavenger.
Hemoglobin is a vasodilator and a nitric oxide scavenger.
Hemoglobin is a vasoconstrictor and a nitric oxide producer.
What happens to nitric oxide when oxygen binds to hemoglobin?
What happens to bound nitric oxide when oxygen binds to hemoglobin?
Bound nitric oxide is released from hemoglobin.
Bound nitric oxide is destroyed by hemoglobin's iron.
Bound nitric oxide is protected from degradation by hemoglobin's iron.
Bound nitric oxide binds to an iron atom on hemoglobin.
What happens to NO when oxygen is unloaded from hemoglobin?
NO is destroyed.
NO is stored in hemoglobin.
NO is released, causing vasodilation.
Nitric oxide binds to an iron atom on hemoglobin.
What happens to deoxygenated hemoglobin as it picks up carbon dioxide?
releases nitric oxide.
It destroys nitric oxide.
It binds nitric oxide and carries these gases to the lungs for unloading.
It converts nitric oxide into another compound.
