Free Blood and Immunity MCQs with Answers

• A. None
• B. Increased plasma skimming
• C. Increased number of RBC in capillaries
• D. RBC rouleax formation

Explanation: Slow blood flow and increased viscosity favour stacking of red cells into coin-like rouleaux formations.

• A. Calcium
• B. Copper
• C. Iron
• D. Aluminum

Explanation: Calcium ions, called factor IV, are required at several stages of the coagulation cascade, especially for the assembly of clotting-factor…

• A. PTA
• B. PTC
• C. VWA
• D. Prothrombin

Explanation: Christmas factor is factor IX, also called plasma thromboplastin component or PTC, in the intrinsic coagulation pathway.

• A. 10 hours
• B. 10 days
• C. 10 weeks
• D. 100 days

Explanation: Platelets normally circulate for approximately 7–10 days before being removed mainly by macrophages in the spleen and liver.

• A. Fibrinogen
• B. Blood cells
• C. Lymphocytes
• D. Plasma colloids

Explanation: Serum is the fluid left after blood has clotted, so fibrinogen has been converted to fibrin and removed with the clot.

• A. A
• B. O
• C. AB
• D. B

Explanation: Group O red cells lack A and B antigens, so the plasma contains both anti-A and anti-B agglutinins.

• A. Water
• B. Serum
• C. Plasma
• D. Tissue fluid

Explanation: Plasma is the fluid portion of unclotted blood and carries cells, proteins, nutrients and wastes.

• A. Fe+2
• B. Prothrombin
• C. Fibrinogen
• D. Calcium

Explanation: Calcium, prothrombin and fibrinogen are essential components of the coagulation process.

• A. MAST cells
• B. Plasma cells
• C. Eosinophils
• D. R.B.C s

Explanation: Plasma cells are differentiated B lymphocytes that actively synthesize and secrete antibodies, making them immunologically active cells.

• A. Vit- A
• B. Cyano cobalamine
• C. Riboflavin
• D. Thiamine

Explanation: Vitamin B12, or cyanocobalamin, is required for DNA synthesis and normal maturation of erythroid and other blood precursor cells.

• A. Bone marrow
• B. Liver
• C. Kidney
• D. Spleen

Explanation: In adults, erythropoietin is produced mainly by oxygen-sensitive interstitial cells of the kidney and stimulates red-cell production in…

• A. Total RBC volume
• B. Total blood volume
• C. Total WBC vlume
• D. Plasma filtrate

Explanation: Hematocrit is the fraction or percentage of whole-blood volume occupied by red blood cells, measured after centrifugation.

• A. Lymphocytes
• B. Neutrophils
• C. Monocytes
• D. Platelets

Explanation: The drumstick is a small nuclear appendage representing the inactive X chromosome, seen in some female neutrophils.

• A. Factor IX
• B. Factor VII
• C. Factor VIII
• D. Factor II

Explanation: Vitamin K is required for synthesis of factors II, VII, IX and X, but factor VIII is not vitamin K-dependent.

• A. 1500 to 2,000cells/C.mm
• B. 500 to 900 cells/C.mm
• C. 1200 to1500cells/C.mm
• D. 40 to 440 cells/C.mm

Explanation: The normal absolute eosinophil count is approximately 40 to 440 cells per cubic millimetre, although reference ranges vary slightly…

• A. -4°C
• B. 4°C
• C. 6°C
• D. 8°C

Explanation: Whole blood and packed red cells are commonly stored at about 2 to 6°C, with 4°C used as the standard exam value.

• A. Released in immunologic response
• B. Allergic cells
• C. Scavenger cells
• D. Leukocytes

Explanation: Histiocytes are tissue macrophages derived from monocytes and act mainly as scavenger cells by phagocytosing debris and pathogens.

• A. Calcium ion
• B. Fibrinogen
• C. Prothrombin
• D. Thrombin

Explanation: Thrombin is the active enzyme formed during coagulation and is not normally present in circulating plasma.

• A. 120 days
• B. 90 days
• C. 12 days
• D. One month

Explanation: Red blood cells circulate for about 120 days before aged cells are removed mainly by macrophages in the spleen, liver and bone marrow.

• A. Antibody production
• B. Complement activation
• C. Lymphokine production and delayed hypersensitivity
• D. Immediate hypersensitivity

Explanation: T lymphocytes do not directly produce antibodies; they coordinate cellular immunity through lymphokines and mediate delayed-type…