$$20.1\ \text{mL O}_2/100\ \text{mL blood}$$

$$\text{Hb} + \text{O}_2 \rightleftharpoons \text{HbO}_2$$

Question 1

Which of the following best describes the role of erythropoietin in red blood cell (RBC) formation?

Accepted Answer

Erythropoietin stimulates the formation of RBCs in bone marrow.

Question 2

A patient is exposed to high altitude for several weeks. Which physiological change is most likely to occur?

Accepted Answer

Increased erythropoietin production and increased blood viscosity.

Question 3

Which statement about hemoglobin is correct?

Accepted Answer

Each hemoglobin molecule can bind four oxygen molecules because it contains four heme groups.

Question 4

What is the oxygen-carrying capacity of hemoglobin in blood, given that 15 grams of hemoglobin can bind 20.1 mL of oxygen per 100 mL of blood?

Accepted Answer

$$20.1\ 	ext{mL O}_2/100\ 	ext{mL blood}$$

Question 5

Which form of hemoglobin is unable to bind oxygen?

Accepted Answer

Hemoglobin with iron in the Fe$$^{3+} ($$ferric) state.

Question 6

Carbon monoxide poisoning is dangerous because:

Accepted Answer

CO binds to hemoglobin with a higher affinity than oxygen, preventing oxygen transport.

Question 7

Which equation best represents the reversible binding of oxygen to hemoglobin?

Accepted Answer

$$	ext{Hb} + 	ext{O}_2 ightleftharpoons 	ext{HbO}_2$$

Question 8

Which of the following best describes the Bohr effect?

Accepted Answer

A decrease in pH or increase in CO$$_2$$ causes hemoglobin to release oxygen more readily.

Question 9

Which of the following is true regarding the oxygen-dissociation curve for fetal hemoglobin compared to adult hemoglobin?

Accepted Answer

Fetal hemoglobin has a higher affinity for oxygen than adult hemoglobin.

Question 10

Which of the following is the primary way carbon dioxide is transported in the blood?

Accepted Answer

As bicarbonate ion (HCO$$_3^-) in $$plasma.

Question 11

What is the chloride shift in the context of carbon dioxide transport?

Accepted Answer

The movement of chloride ions into red blood cells as bicarbonate ions move out.

Question 12

Which enzyme catalyzes the conversion of CO$$_2$$ and H$$_2O to $$HCO$$_3^- in $$red blood cells?

Accepted Answer

Carbonic anhydrase

Question 13

Which of the following factors will shift the oxyhemoglobin dissociation curve to the right?

Accepted Answer

Increased CO$$_2$$, increased temperature, or increased 2,3-DPG

Question 14

A patient with chronic hypoxia is likely to have which of the following changes in their blood?

Accepted Answer

Increased erythropoietin and increased blood viscosity

Question 15

Which of the following best describes myoglobin?

Accepted Answer

Myoglobin is found in muscle and has a higher affinity for oxygen than hemoglobin.

Question 16

Which of the following equations represents the Law of Mass Action for carbon dioxide transport in blood?

Accepted Answer

$$	ext{CO}_2 + 	ext{H}_2	ext{O} ightleftharpoons 	ext{H}_2	ext{CO}_3 ightleftharpoons 	ext{HCO}_3^- + 	ext{H}^+$$

Question 17

Which of the following is a consequence of increased 2,3-DPG in red blood cells?

Accepted Answer

Hemoglobin's affinity for oxygen decreases, facilitating oxygen release to tissues.

Question 18

Which of the following is true regarding the cooperative binding of oxygen to hemoglobin?

Accepted Answer

The binding of each oxygen molecule increases the affinity of hemoglobin for the next oxygen molecule.

Question 19

A patient presents with carboxyhemoglobin in their blood. Which of the following is most likely to be impaired?

Accepted Answer

Transport of oxygen from lungs to tissues.

Transport of Gases in the Blood: Oxygen and Carbon Dioxide Physiology

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