Q: Which of the following equations correctly represents the maximum number of oxygen molecules that can be carried by a single red blood cell, given that each hemoglobin molecule can carry 4 oxygen molecules and each RBC contains approximately $$2.5 \times 10^8$ hemoglobin molecules?

$$4 \times 2.5 \times 10^8$ = 1 \times 10^9$

Question 1

A patient presents with fatigue, pallor, and shortness of breath. Laboratory results show a hematocrit of 30%. Which of the following best describes the patient's condition, and what is the most likely physiological consequence?

Accepted Answer

Anemia; decreased oxygen-carrying capacity of the blood

Question 2

Which of the following best explains why red blood cells (RBCs) are biconcave and lack mitochondria?

Accepted Answer

To increase surface area for gas exchange and prevent consumption of transported oxygen

Question 3

A blood sample is spun in a centrifuge, resulting in three distinct layers. Which layer contains the majority of the body's immune cells, and what is its approximate percentage of total blood volume?

Accepted Answer

Buffy coat; less than 1%

Question 4

A patient with chronic kidney disease develops anemia. Which hormone is most likely deficient, and what is its primary function?

Accepted Answer

Erythropoietin; stimulates red blood cell production

Question 5

Which of the following equations correctly represents the maximum number of oxygen molecules that can be carried by a single red blood cell, given that each hemoglobin molecule can carry 4 oxygen molecules and each RBC contains approximately $$2.5 	imes 10^8$ hemoglobin molecules?

Accepted Answer

$$4 	imes 2.5 	imes 10^8$ = 1 	imes 10^9$

Question 6

A patient with sickle cell anemia experiences severe pain after exercise. Which of the following best explains the pathophysiology behind this symptom?

Accepted Answer

Sickled cells block capillaries, causing tissue ischemia and pain

Question 7

Which plasma protein is most abundant and plays a critical role in maintaining osmotic pressure and transporting substances?

Accepted Answer

Albumin

Question 8

A patient receives a transfusion of type B blood but is type A. What is the most likely immediate consequence?

Accepted Answer

The patient's anti-B antibodies will agglutinate the donor RBCs, causing hemolysis

Question 9

Which of the following best describes the sequence of events in hemostasis after a blood vessel is injured?

Accepted Answer

Vascular spasm, platelet plug formation, coagulation

Question 10

A patient with a genetic deficiency in von Willebrand factor would most likely have which of the following symptoms?

Accepted Answer

Difficulty forming platelet plugs and prolonged bleeding

Question 11

Which white blood cell type is most numerous in a healthy adult and is primarily responsible for phagocytizing bacteria?

Accepted Answer

Neutrophil

Question 12

A patient with liver failure is at risk for bleeding disorders primarily because the liver:

Accepted Answer

Synthesizes many clotting factors

Question 13

Which of the following best explains why a person with type O negative blood is considered a universal donor?

Accepted Answer

Their RBCs lack A, B, and Rh antigens

Question 14

A patient with a high altitude adaptation has an increased hematocrit. What is the most likely physiological benefit of this adaptation?

Accepted Answer

Increased oxygen-carrying capacity

Question 15

Which of the following best describes the fate of the heme portion of hemoglobin after red blood cell destruction?

Accepted Answer

It is stored as iron in the liver and the rest is converted to bilirubin

Question 16

A patient with a low reticulocyte count and anemia is most likely suffering from which underlying problem?

Accepted Answer

Decreased production of new RBCs in the bone marrow

Question 17

Which of the following best explains why Rh-negative mothers are given RhoGAM after delivering an Rh-positive baby?

Accepted Answer

To prevent the mother from forming antibodies against Rh antigen

Question 18

A patient with leukemia has a high white blood cell count but is still susceptible to infections. Why?

Accepted Answer

The WBCs are nonfunctional and do not provide effective immunity

Question 19

Which of the following best describes the role of fibrin in blood clotting?

Accepted Answer

It forms an insoluble mesh that stabilizes the platelet plug

Question 20

A patient with thrombocytopenia is most likely to present with which of the following symptoms?

Accepted Answer

Petechiae and spontaneous bleeding

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