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

$$\text{Hb} + O_2$ \rightleftharpoons \text{HbO}_2$$

Question 1

Hemoglobin is able to transport both oxygen ($$O_2) $$and carbon dioxide ($$CO_2) $$because it binds these molecules in which manner?

Accepted Answer

Reversibly, allowing it to pick up and release them as needed

Question 2

If hemoglobin started binding oxygen ($$O_2) $$irreversibly, what would be the most likely physiological consequence?

Accepted Answer

Your tissues would receive less oxygen

Question 3

Each erythrocyte contains approximately 250 million hemoglobin molecules. If each hemoglobin can bind 4 molecules of oxygen, how many molecules of oxygen can a single erythrocyte carry at a time?

Accepted Answer

$$1\,	ext{billion}$$

Question 4

Why is it important for erythrocytes to have a high surface area to volume ratio?

Accepted Answer

It increases the rate of gas exchange between the erythrocyte and its environment

Question 5

A patient is diagnosed with anemia due to low oxygen-carrying capacity of blood. Which of the following is NOT a possible cause of anemia?

Accepted Answer

Excess erythrocytes

Question 6

Cynthia travels from Miami (low altitude) to the Andes Mountains (high altitude) for a month. Upon returning to Miami, how might her blood differ from a sample taken before her trip?

Accepted Answer

Each of her blood cells would carry fewer hemoglobin molecules

Question 7

How many heme groups are required to synthesize 4 hemoglobin molecules?

Accepted Answer

$$16$$

Question 8

Which part of the hemoglobin molecule is directly responsible for binding oxygen?

Accepted Answer

The heme group containing Fe$$^{2+}$$

Question 9

If a mutation caused hemoglobin to lose its ability to bind $$CO_2$$, which physiological process would be most directly affected?

Accepted Answer

Carbon dioxide removal from tissues to lungs

Question 10

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

Accepted Answer

$$	ext{Hb} + O_2$ ightleftharpoons 	ext{HbO}_2$$

Question 11

A patient has a genetic disorder causing malformed hemoglobin that cannot bind iron. What is the most direct consequence?

Accepted Answer

Reduced ability to transport $$O_2$$

Question 12

Which of the following best explains why carbon monoxide ($$CO) $$poisoning is so dangerous?

Accepted Answer

$$CO$$ binds to hemoglobin irreversibly, preventing $$O_2$$ transport

Question 13

If a person has a mutation that causes their hemoglobin to bind $$O_2$$ less tightly, what would be the most likely effect at the tissue level?

Accepted Answer

Tissues would receive more oxygen

Question 14

Which of the following statements about the structure of hemoglobin is correct?

Accepted Answer

Hemoglobin is a 4-subunit protein, each with a heme group containing Fe$$^{2+}$$

Question 15

Which of the following would most likely increase the oxygen-carrying capacity of blood?

Accepted Answer

Increasing the number of erythrocytes

Question 16

A patient is exposed to high levels of $$CO_2 in a $$poorly ventilated room. What effect would this have on hemoglobin's ability to bind $$O_2$$?

Accepted Answer

Hemoglobin's affinity for $$O_2$$ would decrease

Question 17

Which formula correctly calculates the total number of oxygen molecules carried by $$n$$ erythrocytes, given each erythrocyte contains $$m$$ hemoglobin molecules and each hemoglobin binds $$4$$ oxygen molecules?

Accepted Answer

$$n 	imes m 	imes 4$$

Question 18

Which of the following is a direct result of hemoglobin's ability to bind $$O_2$$ and $$CO_2$$ reversibly?

Accepted Answer

Efficient gas exchange between lungs and tissues

Question 19

If a person has a deficiency in iron, which step in hemoglobin synthesis is most directly affected?

Accepted Answer

Formation of the heme group

Hemoglobin: Structure, Function, and Clinical Relevance

Guida di studio - Domande di pratica

Study guide - Flashcard