Deck 24: Oxygen and Carbon Dioxide Transport

Question 1

The dissociation curve of CO₂ in blood is:

A)Linear and directly related to partial pressure of carbon dioxide (Pco₂).
B)Linear and not related to Pco₂.
C)Not linear
D)Linear and directly related to partial pressure of oxygen (Po₂).
E)S-shaped and directly related to Pco₂.

Answer 1

A

Question 2

The ability of CO₂ to alter the affinity of hemoglobin for O₂,which enhances O₂ delivery to tissues and O₂ uptake in the lungs,is referred to as:

A)Chloride shift
B)Haldane's effect
C)Bohr's effect
D)Hamburger's phenomenon
E)Graham's effect

Answer 2

C

Question 3

A 48-year-old man presents with a low Pao₂,low oxygen content in arterial blood (Cao₂),low amount of O₂ delivered,and a normal amount of O₂ utilized.He is probably suffering from what type of hypoxia?

A)Circulatory
B)Hypoxic
C)Anemic
D)Histotoxic

Answer 3

B

Question 4

A 10-year-old girl with primary pulmonary hypertension is receiving nitric oxide therapy for its vasodilatation properties.She presents with a deficiency in oxygen-carrying capacity with the hemoglobin iron molecule in the ferric acid state and a methemoglobin level of 10%.She probably has a condition known as:

A)Sickle cell disease.
B)Anemia.
C)Methemoglobinemia.
D)Hypoxic shock.
E)Restrictive lung disease.

Question 5

A 62-year-old woman is admitted to the hospital with fever and pneumonia.How is her O₂ dissociation curve affected by her clinical status?

A)A shift to the left
B)A shift to the right
C)No change
D)A downward shift
E)An upward shift

Question 6

The predominant transport mechanism of CO₂ in blood is by:

A)Dissolved CO₂.
B)Carbamino protein complexes.
C)Hemoglobin binding.
D)HCO₃^- within red blood cells.
E)Deoxyhemoglobin

Question 7

A 44-year-old man who has experienced trauma is given multiple blood transfusions because of severe blood loss.What influence would this treatment have on his O₂ dissociation curve?

A)A shift to the left
B)A shift to the right
C)No change
D)A downward shift
E)An upward shift

Question 8

A 12-year-old girl of Hispanic descent enters the emergency department with severe pain on the left side of her abdomen.The family has recently immigrated to the United States.First attempts at pain relief with nonnarcotic drugs are unsuccessful.Opioids are needed to suppress the pain.Her laboratory results show that she is anemic and her parents reveal a history of chronic infections and a stroke.Genetic testing reveals that her hemoglobin gene has a single amino acid substitution of valine for glutamic acid.Her primary diagnosis is:

A)Blunt traumatic injury to the spleen.
B)Aneurysm.
C)Sickle cell disease.
D)Cystic fibrosis

Question 9

Pulmonary vascular resistance increases during hypoxia; how should it behave during exercise?

A)Decreases
B)Initially stays the same and then increases with time
C)Increases
D)Stays the same; not influenced

Question 10

Tissue hypoxia is caused by all of the following except:

A)Anemia.
B)Carbon monoxide poisoning.
C)Cyanide poisoning.
D)Shock.
E)Pneumonia.