Blood and Hematopoiesis Practice Quiz (28 questions)

1. Which description best characterizes blood and its major roles in the body?

A. A reddish liquid tissue that circulates in vessels, transports substances, and helps protect against disease

B. A reddish solid tissue that remains in vessels, transports oxygen, and produces immune cells

C. A clear tissue fluid that circulates in vessels, stores nutrients, and regulates body temperature

D. A yellowish liquid tissue that circulates in vessels, digests nutrients, and removes all body waste

Answer: (A)

Explanation

Blood is a reddish liquid tissue that circulates through vessels, transports substances, and contributes to protection from disease. The clear tissue fluid description is closer to lymph and does not capture blood’s defining characteristics.

2. Which two components make up blood?

A. Serum and tissue cells suspended in it

B. Plasma and dissolved gases suspended in it

C. Plasma and blood cells suspended in it

D. Lymph and blood cells suspended in it

Answer: (C)

Explanation

Blood consists of plasma with blood cells suspended in the plasma. Lymph is a distinct body fluid, not one of the two components listed as making up blood.

3. What is plasma?

A. The reddish cellular part of blood, made mainly of hemoglobin and dissolved minerals

B. The dense protein layer of blood, made mainly of clotting factors and antibodies

C. The clear fluid inside lymph vessels, made mainly of water and immune cells

D. The transparent, yellowish liquid part of blood, made mainly of water and dissolved substances

Answer: (D)

Explanation

Plasma is the transparent, yellowish liquid component of blood and consists mainly of water and dissolved substances. The reddish cellular description instead fits blood cells, not plasma.

4. A sample contains about 75 g of plasma proteins per litre, including albumin, globulins, and clotting factors. Which set of functions do these proteins support?

A. Oxygen production, heat generation, and waste filtration

B. Clotting, transport, and defence against infection

C. Hormone breakdown, bone growth, and carbon dioxide production

D. Blood-cell formation, vessel contraction, and digestion

Answer: (B)

Explanation

Plasma contains approximately 70–80 g of proteins per litre, and these proteins contribute to clotting, transport, and defence against infection. Oxygen transport is chiefly associated with hemoglobin in red blood cells, not this set of plasma-protein functions.

5. Which plasma proteins act as antibodies involved in defence against infections?

A. Clotting factors, which form fibrin during coagulation

B. Albumins, which regulate water distribution

C. Transport globulins, which carry minerals in plasma

D. Gamma globulins, also called immunoglobulins

Answer: (D)

Explanation

Gamma globulins, or immunoglobulins, form antibodies that help defend against infections. Albumin has important plasma functions, but it is not the antibody group described here.

6. A blood cell is the most numerous type and carries oxygen from the lungs to body tissues using hemoglobin. What is it?

A. A platelet, also called a thrombocyte

B. A red blood cell, also called an erythrocyte

C. A lymphocyte, a type of leukocyte

D. A white blood cell, also called a leukocyte

Answer: (B)

Explanation

Red blood cells, or erythrocytes, are the most numerous blood cells and transport oxygen using hemoglobin. Leukocytes defend against infection rather than serving as the main oxygen-carrying cells.

7. Which feature distinguishes leukocytes from erythrocytes in normal blood?

A. Leukocytes lack a nucleus and carry oxygen using hemoglobin

B. Leukocytes have a nucleus and help defend against infection

C. Leukocytes contain iron that gives blood its red colour

D. Leukocytes form platelet plugs and help limit bleeding

Answer: (B)

Explanation

White blood cells, or leukocytes, are nucleated cells that defend against infection. The claim that they lack a nucleus and carry oxygen describes a mistaken transfer of red blood cell characteristics.

8. A white blood cell differential shows 55% neutrophils. How should this result be interpreted against the stated main leukocyte proportions?

A. It falls within the typical neutrophil proportion of 45–70%

B. It exceeds the typical monocyte proportion of 3–7%

C. It falls within the typical lymphocyte proportion of 25–30%

D. It exceeds the typical eosinophil proportion of 1–3%

Answer: (A)

Explanation

Neutrophils normally account for about 45–70% of leukocytes, so 55% is within the stated range. The lymphocyte range is much lower, at approximately 25–30%.

9. After a small vessel is injured, which platelet action helps limit bleeding at the site?

A. Platelets carry oxygen to the injury and release hemoglobin into the blood

B. Platelets destroy invading microbes and release antibodies into the blood

C. Platelets form a plug at the injury and release substances that aid healing

D. Platelets produce new red cells and release iron into the vessel wall

Answer: (C)

Explanation

Platelets help protect vessel walls, form a plug to limit bleeding at an injury, and release substances that support wound healing. Antibody production is associated with immune cells, not platelet action.

10. Which description best characterizes hematopoiesis?

A. The formation of blood cells, mainly in bone marrow, from self-renewing pluripotent stem cells that generate lineage-specific monopotent stem cells

B. The maturation of blood cells in the bloodstream from stem cells that cannot renew themselves

C. The formation of blood cells in lymphoid organs from mature cells that can switch between lineages

D. The formation of blood cells in bone marrow from lineage-specific cells that produce only identical copies of themselves

Answer: (A)

Explanation

Hematopoiesis forms blood cells mainly in bone marrow, beginning with pluripotent stem cells that can self-renew and produce lineage-specific monopotent stem cells. The option describing mature cells switching lineages is wrong because the process starts from pluripotent stem cells.

11. Which formation process produces platelets?

A. Lymphopoiesis

B. Granulopoiesis

C. Erythropoiesis

D. Thrombocytopoiesis

Answer: (D)

Explanation

Thrombocytopoiesis is the process that forms platelets. Erythropoiesis forms red cells, while granulopoiesis and lymphopoiesis form granulocytes and lymphocytes, respectively.

12. Why must erythropoiesis continuously produce large numbers of red blood cells?

A. Red cells live about 120 days, so roughly 30 billion must be produced each day to replace them

B. Red cells live about 5–8 days, so roughly 100–250 billion must be produced each day to replace them

C. Red cells live about 120 days, so roughly 100–250 billion must be produced each day to replace them

D. Red cells live about 9–10 days, so roughly 30 billion must be produced each day to replace them

Answer: (C)

Explanation

Erythropoiesis continuously produces about 100–250 billion red cells per day because red cells survive for about 120 days and must be replaced as they age. The 30-billion figure applies to daily granulocyte production, not red-cell replacement.

13. Which sequence describes key changes as a developing red cell matures?

A. It multiplies and shrinks, produces hemoglobin, loses its nucleus to become a reticulocyte, and then matures into a red cell

B. It produces hemoglobin and enlarges, becomes a reticulocyte while retaining its nucleus, and then loses it as a mature red cell

C. It enlarges and produces hemoglobin, retains its nucleus as a reticulocyte, and then matures into a red cell

D. It multiplies and shrinks, loses its nucleus before producing hemoglobin, and then matures into a reticulocyte

Answer: (A)

Explanation

During erythropoiesis, developing cells multiply and shrink, produce hemoglobin, lose their nuclei to become reticulocytes, and then mature into red blood cells. The option placing nucleus loss after the reticulocyte stage reverses the described sequence.

14. Which statement correctly describes granulopoiesis?

A. It forms polynuclear leukocytes in lymphoid organs over about 5–8 days, producing approximately 30 billion granulocytes daily

B. It forms polynuclear leukocytes in bone marrow over about 9–10 days, producing approximately 30 billion granulocytes daily

C. It forms red blood cells in bone marrow over about 9–10 days, producing approximately 30 billion cells daily

D. It forms lymphocytes in bone marrow over about 9–10 days, producing approximately 100–250 billion cells daily

Answer: (B)

Explanation

Granulopoiesis forms polynuclear leukocytes in bone marrow, takes about 9–10 days, and produces approximately 30 billion granulocytes daily. The option assigning the process to lymphoid organs gives the wrong site.

15. Which sequence correctly orders granulocyte development?

A. Myeloblast, myelocyte, promyelocyte, band cell, metamielocyte, mature granulocyte

B. Myeloblast, promyelocyte, metamielocyte, myelocyte, band cell, mature granulocyte

C. Promyelocyte, myeloblast, myelocyte, metamielocyte, mature granulocyte, band cell

D. Myeloblast, promyelocyte, myelocyte, metamielocyte, band cell, mature granulocyte

Answer: (D)

Explanation

Granulocytes develop through the sequence myeloblast, promyelocyte, myelocyte, metamielocyte, band cell, and mature granulocyte. The option that places metamielocytes before myelocytes reverses those developmental stages.

16. What is lymphopoiesis?

A. The formation of lymphocytes, beginning in bone marrow as monopotent stem cells produce immature lymphoblasts

B. The maturation of red blood cells, beginning when lymphoblasts enter the bloodstream

C. The formation of granulocytes, beginning when multipotent stem cells mature in the thymus

D. The formation of platelets, beginning when bone-marrow stem cells produce immature megakaryocytes

Answer: (A)

Explanation

Lymphopoiesis is the formation of lymphocytes, which starts in bone marrow with monopotent stem cells producing immature lymphoblasts. Platelet formation instead involves fragmentation of megakaryocyte cytoplasm.

17. During embryonic development, where do immature lymphocytes mature into B cells and T cells, respectively?

A. B cells mature in the thymus, while T cells mature in intestinal lymphoid tissue

B. B cells mature in bone marrow, while T cells mature in the spleen

C. B cells mature in the spleen, while T cells mature in bone marrow

D. B cells mature in intestinal lymphoid tissue, while T cells mature in the thymus

Answer: (D)

Explanation

Some immature lymphocytes mature into B cells in intestinal lymphoid tissue, while others mature into T cells in the thymus. The thymus is not the site of B-cell maturation in this developmental distinction.

18. How do platelets enter the blood during their formation in bone marrow?

A. A red blood cell releases fragments of its membrane into nearby blood vessels

B. A megakaryocyte's cytoplasm fragments into membrane-bounded units that enter the blood

C. A stem cell separates into platelet-sized units before becoming a megakaryocyte

D. A lymphoblast divides into small membrane-bounded units that enter the blood

Answer: (B)

Explanation

Platelets form when a megakaryocyte's cytoplasm fragments into membrane-bounded units that enter the blood. Lymphoblasts are involved in lymphocyte formation rather than platelet production.

19. If an adult's bone marrow can no longer sustain blood-cell formation, what may happen?

A. The thymus may become the main site of red-cell production

B. Intestinal lymphoid tissue may replace bone marrow for all blood-cell formation

C. The liver or spleen may resume blood-cell-forming activity

D. Yellow marrow may begin producing blood cells throughout the skeleton

Answer: (C)

Explanation

Adult hematopoiesis occurs mainly in bone marrow, but the liver or spleen can regain blood-cell-forming activity if marrow activity fails. The thymus supports T-cell maturation rather than becoming the main site of red-cell production.

20. Which statement distinguishes red marrow from yellow marrow?

A. Red marrow is found in lymphoid organs, whereas yellow marrow forms blood cells throughout adult bones

B. Red marrow and yellow marrow both form blood cells, but only yellow marrow is active before puberty

C. Red marrow contains abundant fat, whereas yellow marrow forms blood cells in some bones after puberty

D. Red marrow forms blood cells, whereas yellow marrow contains abundant fat and loses hematopoietic activity in some bones after puberty

Answer: (D)

Explanation

Red marrow is hematopoietic, while yellow marrow contains abundant fat and loses that activity in some bones after puberty. The reverse assignment of blood-cell formation to yellow marrow is incorrect.

21. Which description of the thymus and its activity is accurate?

A. It produces platelets, is most active in adulthood, and begins to atrophy during childhood

B. It supports B-cell maturation, is most active after puberty, and begins to atrophy in fetal life

C. It supports T-cell maturation, is most active in fetal life and childhood, and begins to atrophy at puberty

D. It stores aged blood cells, is most active in childhood, and begins to atrophy before birth

Answer: (C)

Explanation

The thymus supports T-cell maturation, has its greatest activity during fetal life and childhood, and begins to atrophy at puberty. Its role is not B-cell maturation, which occurs in intestinal lymphoid tissue during embryonic development.

22. What determines a person's blood group, and why is blood typing needed before transfusion?

A. The shape of red blood cells determines the group, and typing predicts their lifespan after transfusion

B. Antibodies in plasma determine the group, and typing identifies the donor's blood-cell count

C. The amount of hemoglobin determines the group, and typing identifies the recipient's marrow activity

D. Antigenic components on red blood cells determine the group, and typing helps ensure transfusion compatibility

Answer: (D)

Explanation

Blood groups classify human blood by antigenic components on red blood cells, so typing is necessary before transfusion to assess compatibility. Antibodies are relevant to compatibility but do not replace red-cell antigens as the basis of the classification.

23. A person's red blood cells carry antigen B, and their blood contains anti-A antibodies; which ABO group do they have?

A. Group AB

B. Group B

C. Group O

D. Group A

Answer: (B)

Explanation

Group B red blood cells carry antigen B, and the blood contains anti-A antibodies. Group A has the opposite antigen-antibody pattern: antigen A with anti-B antibodies.

24. How do the red-cell antigens and antibodies of groups AB and O differ?

A. Group AB has both antigens and both antibodies; group O has neither antigen and neither antibody

B. Group AB has antigen A and anti-B antibodies; group O has antigen B and anti-A antibodies

C. Group AB has both A and B antigens and neither antibody; group O has neither antigen and both anti-A and anti-B antibodies

D. Group AB has neither antigen and both antibodies; group O has both antigens and neither antibody

Answer: (C)

Explanation

Group AB carries both A and B antigens and has neither antibody, while group O carries neither antigen and has both anti-A and anti-B antibodies. Group O does not carry both antigens; that antigen pattern belongs to group AB.

25. A person has phenotype A in the ABO system; which statement correctly describes the possible genotype?

A. The genotype may be AA or AO because A dominates O, so phenotype alone cannot distinguish them

B. The genotype may be AB or AO because B dominates O, so phenotype alone cannot distinguish them

C. The genotype must be AO because A is recessive to O, so AA produces a different phenotype

D. The genotype must be AA because A and O are codominant, so AO produces a different phenotype

Answer: (A)

Explanation

A dominates O, so both AA and AO produce phenotype A, and the phenotype alone cannot distinguish those genotypes. A and B are codominant with each other, but that does not make A and O codominant.

26. What distinguishes Rh-positive red cells from Rh-negative red cells?

A. Neither type carries the Rh antigen, but Rh-positive cells can produce it.

B. Both types carry the Rh antigen, but Rh-negative cells carry less of it.

C. Rh-positive red cells carry the Rh antigen, while Rh-negative red cells lack it.

D. Rh-positive red cells lack the Rh antigen, while Rh-negative red cells carry it.

Answer: (C)

Explanation

Rh status depends on whether red cells carry the Rh antigen: positive cells carry it, whereas negative cells lack it. The claim that Rh-negative cells carry the antigen reverses the distinction.

27. An Rh-negative patient receives Rh-positive red cells. What immune consequence can result?

A. The donor cells can develop antibodies against the recipient's Rh-negative red cells.

B. The recipient becomes tolerant to the Rh antigen because the transfused cells carry it.

C. The transfusion has the same response pattern as Rh-negative cells given to an Rh-positive patient.

D. The recipient can mount an immune response against the Rh antigen on the transfused cells.

Answer: (D)

Explanation

Rh-positive transfused cells can expose an Rh-negative recipient to the Rh antigen and trigger an immune response. The reverse-direction transfusion does not trigger the response described, so the two directions are not equivalent.

28. How can Rh incompatibility lead to hemolytic disease of the newborn in a later pregnancy?

A. Rh-positive fetal cells can immunize an Rh-negative mother, but her antibodies remain in her blood and cannot affect a later fetus.

B. Rh-negative fetal cells can immunize an Rh-negative mother, whose antibodies may later cross the placenta and harm an Rh-positive fetus.

C. Rh-positive fetal cells can immunize an Rh-negative mother, whose antibodies may later cross the placenta and harm an Rh-positive fetus.

D. Rh-negative fetal cells can immunize an Rh-positive mother, whose antibodies may later cross the placenta and harm an Rh-negative fetus.

Answer: (C)

Explanation

An Rh-negative mother may become immunized when Rh-positive fetal red cells cross the placenta; in a later pregnancy, her antibodies can cross the placenta and cause disease in an Rh-positive fetus. The claim that those antibodies cannot reach a later fetus contradicts this placental transfer.