Question 1

Which of the following best explains why erythrocytes (red blood cells) have a biconcave shape?

Accepted Answer

To maximize their surface area-to-volume ratio for efficient gas exchange

Question 2

A patient presents with pale skin, fatigue, and swelling of the tissues. Laboratory tests reveal a low hematocrit and low hemoglobin. Which of the following best explains the swelling?

Accepted Answer

Reduced blood osmolarity leads to more fluid leaving the bloodstream and entering tissues

Question 3

Which plasma protein is most responsible for maintaining blood osmotic pressure and transporting substances?

Accepted Answer

Albumin

Question 4

A person with type AB blood can safely receive blood from which of the following ABO types?

Accepted Answer

All ABO types (A, B, AB, O)

Question 5

Which of the following equations correctly represents the bicarbonate buffer system in blood?

Accepted Answer

$$\mathrm{CO_2$ + H_2O \rightleftharpoons H_2CO_3 \rightleftharpoons $$HCO_3$$^- + H^+}$$

Question 6

Which of the following is a direct stimulus for increased erythropoietin (EPO) secretion?

Accepted Answer

Low oxygen levels in the blood (hypoxemia)

Question 7

A patient with a genetic defect preventing the production of heme would most likely exhibit which of the following symptoms?

Accepted Answer

Extreme sensitivity to light and chronic fatigue

Question 8

Which of the following best describes the fate of iron after erythrocyte destruction?

Accepted Answer

It is stored in the liver as ferritin or transported in the blood by transferrin

Question 9

Which of the following is a function of platelets in hemostasis?

Accepted Answer

Forming a temporary plug by sticking to exposed collagen fibers

Question 10

A patient with hemophilia A is deficient in which clotting factor?

Accepted Answer

Factor VIII

Question 11

Which of the following best explains why blood is classified as a connective tissue?

Accepted Answer

It consists of cells suspended in a nonliving matrix (plasma)

Question 12

Which of the following white blood cells is most numerous and is specialized for phagocytizing bacteria?

Accepted Answer

Neutrophil

Question 13

A patient with type O blood receives a transfusion of type A blood. What is the most likely outcome?

Accepted Answer

Agglutination and possible hemolytic transfusion reaction

Question 14

Which of the following is a possible consequence of a thrombus forming in an unbroken blood vessel?

Accepted Answer

Blocked circulation leading to tissue death

Question 15

Which vitamin is essential for the synthesis of several clotting factors in the liver?

Accepted Answer

Vitamin K

Question 16

Which of the following best describes the role of the kidney in erythropoiesis?

Accepted Answer

It senses hypoxia and releases erythropoietin to stimulate red bone marrow

Question 17

Which of the following is true regarding the Rh blood group system?

Accepted Answer

Rh- individuals only produce anti-D antibodies after exposure to Rh+ blood

Question 18

Which of the following best explains why a reticulocyte count is clinically useful?

Accepted Answer

It indicates the rate of erythrocyte (RBC) formation in the bone marrow

Question 19

Which of the following best describes the process of diapedesis?

Accepted Answer

The ability of leukocytes to exit the bloodstream and enter tissues

Question 20

A patient with chronic kidney disease develops anemia. Which of the following best explains this finding?

Accepted Answer

The kidneys are unable to produce sufficient erythropoietin

Blood: Structure, Function, and Clinical Relevance

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