1 :

Hint : 🩸 Use it → drop it → don’t recap

Correct Answers:

  • True

Rationale :

🟦 Used needles and sharps must be disposed of immediately after use to prevent accidental injury.

🟦 Sharps containers are puncture-resistant, leak-proof, and clearly labeled to reduce exposure risk.

🟦 Delayed disposal increases the likelihood of needlestick injuries and bloodborne pathogen transmission.

🟦 Occupational safety standards require disposal at the point of use.

🟦 Proper sharps handling protects healthcare workers, patients, and waste handlers.

❌ False

❌ Delaying disposal increases injury and infection risk.

❌ This practice violates standard safety protocols.

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2 :

Hint : 🫁 Hemoglobin = O₂ delivery + CO₂ removal

Correct Answers:

  • Oxygen and carbon dioxide

Rationale :

🟦 Hemoglobin binds oxygen in the lungs and delivers it to peripheral tissues.

🟦 It also facilitates transport of carbon dioxide from tissues back to the lungs.

🟦 Carbon dioxide is carried both bound to hemoglobin and as bicarbonate in plasma.

🟦 This dual gas transport role is essential for cellular metabolism and acid–base balance.

🟦 Without adequate hemoglobin, tissue oxygenation and CO₂ removal are impaired.

❌ Hydrogen and oxygen

❌ Hydrogen ions are buffered, not transported as a gas.

❌ Oxygen transport alone does not define hemoglobin’s full role.

❌ Oxygen and nitrogen

❌ Nitrogen is not transported by hemoglobin.

❌ It remains largely inert in the bloodstream.

❌ Carbon dioxide and nitrogen

❌ Nitrogen is not physiologically transported by hemoglobin.

❌ Oxygen transport is a primary function being omitted.

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3 :

Hint : 🩸 Low RBCs = low hematocrit

Correct Answers:

  • Anemia

Rationale :

🟦 Hematocrit reflects the percentage of red blood cells in circulating blood.

🟦 Anemia is characterized by reduced red blood cell mass, which lowers hematocrit.

🟦 Conditions that increase oxygen demand stimulate erythropoiesis, raising hematocrit.

🟦 Anemia does the opposite by decreasing oxygen-carrying capacity.

🟦 Identifying low hematocrit helps detect underlying hematologic or systemic disease.

❌ Increased exercise

❌ Chronic exercise stimulates red blood cell production.

❌ This increases hematocrit over time.

❌ Relocation to higher elevation

❌ Hypoxia at altitude increases erythropoietin release.

❌ This raises hematocrit.

❌ Polycythemia

❌ Polycythemia is defined by elevated red blood cell mass.

❌ Hematocrit is increased.

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4 :

Hint : 🫁 Oxygen binds hemoglobin

Correct Answers:

  • Erythrocytes

Rationale :

🔴 Erythrocytes are the primary blood cells responsible for transporting oxygen throughout the body.

🔴 They contain hemoglobin, a protein that binds oxygen molecules in the lungs and carries them to peripheral tissues.

🔴 Their biconcave shape increases surface area, enhancing oxygen diffusion and transport efficiency.

🔴 The absence of a nucleus allows erythrocytes to carry a higher concentration of hemoglobin.

🔴 This structure and function make erythrocytes uniquely specialized for oxygen delivery.

❌ Basophils

❌ Basophils function in allergic and inflammatory responses, not oxygen transport.

❌ They release histamine and heparin rather than carrying hemoglobin.

❌ Neutrophils

❌ Neutrophils are infection-fighting white blood cells involved in phagocytosis.

❌ They do not contain hemoglobin or participate in gas exchange.

❌ Platelets

❌ Platelets are responsible for blood clotting and hemostasis.

❌ They are cell fragments and have no role in oxygen transport.

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5 :

Hint : 🩸 Low platelets = bleeding risk

Correct Answers:

  • True

Rationale :

🔵 Thrombocytopenia is defined as an abnormally low platelet count.

🔵 Platelets are essential for primary hemostasis, forming the initial platelet plug at injury sites.

🔵 A reduced platelet level impairs clot formation and prolongs bleeding time.

🔵 Clients may develop petechiae, bruising, or hemorrhage even with minor trauma.

🔵 This directly increases the risk of excessive or uncontrolled bleeding.

❌ False

❌ This option ignores the essential role of platelets in clot formation.

❌ Denying this relationship can delay recognition of serious bleeding disorders.

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6 :

Hint : 🧠 Lymphocytes > monocytes

Correct Answers:

  • True

Rationale :

🟢 Lymphocytes normally outnumber monocytes in a healthy differential white blood cell count.

🟢 Lymphocytes are key components of adaptive immunity, including antibody and cell-mediated responses.

🟢 Monocytes serve mainly as precursors to macrophages and dendritic cells and are fewer in circulation.

🟢 This proportional difference reflects normal immune system structure.

🟢 Therefore, lymphocyte predominance over monocytes is a normal finding.

❌ False

❌ This option incorrectly suggests abnormal lab interpretation.

❌ Misreading normal differentials may lead to unnecessary diagnostic concern.

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7 :

Hint : 🧲 Antibody meets antigen

Correct Answers:

  • Agglutination, or clumping of cells

Rationale :

🧲 Agglutination occurs when antibodies (agglutinins) bind to their matching antigens (agglutinogens) on red blood cells.

🧲 This antigen–antibody reaction causes red blood cells to clump together, obstructing blood flow.

🧲 Clumped cells can rupture, leading to hemolysis and release of free hemoglobin into circulation.

🧲 This reaction can impair circulation, reduce oxygen delivery, and trigger systemic complications.

🧲 Agglutination is the primary and immediate immune response seen in incompatible blood transfusions.

❌ Breakdown of hemoglobin

❌ Hemoglobin breakdown occurs after cell destruction, not as the initial immune response.

❌ The primary event is cell clumping, which may later lead to hemolysis.

❌ No immune response

❌ Incompatible transfusions always trigger an immune reaction.

❌ Absence of response occurs only with compatible blood types.

❌ Increase in oxygen transport

❌ Clumping actually reduces oxygen delivery by obstructing circulation.

❌ Oxygen transport efficiency is impaired, not enhanced.

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8 :

Hint : 🩸 Prevents Rh sensitization

Correct Answers:

  • True

Rationale :

🩷 RhoGAM is an injection containing Rh immune globulin given to Rh-negative mothers.

🩷 It prevents the mother’s immune system from recognizing Rh-positive fetal red blood cells as foreign.

🩷 This stops the formation of anti-Rh antibodies, which could attack fetal cells in future pregnancies.

🩷 Preventing antibody formation protects against hemolytic disease of the newborn.

🩷 RhoGAM is routinely administered during pregnancy and after delivery when indicated.

❌ False

❌ This option ignores the preventive role of RhoGAM in Rh incompatibility.

❌ Without RhoGAM, maternal sensitization can occur and endanger future pregnancies.

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9 :

Hint : 🧪 Match antigen to antibody

Correct Answers:

  • Anti-B well

Rationale :

🧪 Type B blood contains B antigens on the surface of red blood cells.

🧪 The Anti-B reagent contains antibodies that specifically bind to B antigens.

🧪 When Anti-B antibodies bind to B antigens, visible agglutination occurs.

🧪 This confirms the presence of B antigens on the red blood cells.

🧪 Agglutination in this well is expected and normal for type B blood.

❌ Anti-A well

❌ Type B blood lacks A antigens, so Anti-A antibodies have nothing to bind to.

❌ No agglutination would occur in this well.

❌ Anti-D well

❌ Agglutination here depends on Rh status, not ABO type alone.

❌ Without Rh-positive blood, this well would remain negative.

❌ All wells would be negative

❌ At least one well must agglutinate to identify blood type.

❌ Type B blood will always react with Anti-B reagent.

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10 :

Hint : 🩸 Universal recipient = AB+

Correct Answers:

  • False

Rationale :

🟣 A person with A and B antigens and the D antigen is blood type AB+.

🟣 While AB+ individuals have no anti-A or anti-B antibodies, compatibility still depends on donor Rh status only being positive or negative appropriately.

🟣 AB+ can receive blood from all ABO and Rh types, but the statement claims this applies universally without clarification, making it misleading.

🟣 The concept is correct for AB+ specifically, not as a general rule.

🟣 Precision matters in transfusion medicine to prevent fatal reactions.

❌ True

❌ This option overgeneralizes compatibility without specifying blood type context.

❌ Transfusion rules must always be applied to a defined blood group.

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