Free Blood and Immunity MCQs with Answers
81 Blood and Immunity MCQs from Physiology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. None
- B. Hyperparathyrodism
- C. Rickets
- D. Tetany
Explanation: Calcium ions are required at several steps of the coagulation cascade, so severe hypocalcaemia can impair coagulation.
Correct answer: Tetany- A. Lack of vitamin K
- B. Decreased level of prothrombin
- C. Platelet deficiency
- D. Lack of vitamin B
Explanation: Damaged liver cannot adequately synthesize prothrombin and other clotting factors, making reduced prothrombin a major cause of bleeding.
Correct answer: Decreased level of prothrombin- A. Toxic transport
- B. Drug transport
- C. Oncotic pressure
- D. Coagulation
Explanation: Albumin is the most abundant plasma protein and provides most of the plasma colloid osmotic pressure, helping retain water within the…
Correct answer: Oncotic pressure- A. production of lymphokines and delayed hypersensitivity
- B. Production of Antibodies
- C. Activation of complement system
- D. Immediate Hypersensitivity
Explanation: T lymphocytes coordinate cellular immunity by releasing lymphokines and mediate delayed-type hypersensitivity reactions.
Correct answer: production of lymphokines and delayed hypersensitivity- A. EDTA
- B. Potassium oxalate+ sodium fluoride
- C. Heparin
- D. Potassium oxalate
Explanation: Sodium fluoride inhibits glycolysis and potassium oxalate prevents clotting, together preserving the blood glucose concentration during…
Correct answer: Potassium oxalate+ sodium fluoride- A. Irregular renewal
- B. Infrequent renewal
- C. Regular renewal
- D. None of the above
Explanation: Blood cells have continuous, regulated production because mature cells have limited lifespans and must be replaced regularly.
Correct answer: Regular renewal- A. Yolk sac
- B. Long bones
- C. Liver
- D. Flat bones
Explanation: By about 20 years of age, active red-cell production is concentrated mainly in the axial skeleton, particularly the flat bones such as the…
Correct answer: Flat bones- A. HbA
- B. HbH
- C. HbM
- D. HbS
Explanation: HbA, composed of two alpha and two beta chains, is the predominant normal haemoglobin in healthy adults.
Correct answer: HbA- A. Nervous tissue
- B. Connective tissue
- C. Epithelial tissue
- D. Muscular tissue
Explanation: Plasma cells are antibody-secreting cells derived from B lymphocytes and are classified as connective-tissue cells because they occur…
Correct answer: Connective tissue- A. Neutrophil
- B. Eosinophil
- C. Monocyte
- D. All of the above
Explanation: Tissue macrophages develop from circulating monocytes that leave the blood and differentiate within tissues.
Correct answer: Monocyte- A. O group and Rh+ ve
- B. AB group and Rh - ve
- C. AB group and Rh+ ve
- D. O group and Rh- ve
Explanation: No agglutination with anti-A or anti-B indicates that the red cells lack A and B antigens, identifying group O.
Correct answer: O group and Rh- ve- A. Anti - A & Anti - B
- B. Neither anti A nor anti - B
- C. Anti - A
- D. Anti - B
Explanation: AB red cells possess both A and B antigens, so the plasma normally contains neither anti-A nor anti-B agglutinin.
Correct answer: Neither anti A nor anti - B- A. Buffer basic groups of coagulation factors
- B. Bind factor XII
- C. Chelate calcium
- D. Bind vitamin K
Explanation: Citrate prevents coagulation by binding ionized calcium, which is required at several stages of the coagulation cascade.
Correct answer: Chelate calcium- A. Viscidity
- B. Fibrinogen
- C. All of the above
- D. Rouleaux
Explanation: ESR is influenced by plasma proteins such as fibrinogen, which promote rouleaux formation, and by plasma viscosity.
Correct answer: All of the above- A. High Altitude
- B. Cerebellar hemangioblastoma
- C. Pheochromocytoma
- D. Myeloproliferative changes
Explanation: Myeloproliferative disorders, especially polycythemia vera, cause primary rather than secondary polycythemia because the marrow produces…
Correct answer: Myeloproliferative changes- A. IX
- B. VII
- C. II
- D. X
Explanation: Factor VII belongs exclusively to the tissue-factor, or extrinsic, pathway.
Correct answer: VII- A. Fibrinogen
- B. Globulin
- C. Albumin
- D. Collagen
Explanation: Albumin produces most of the plasma colloid osmotic pressure because it is present in high concentration and is relatively small, giving…
Correct answer: Albumin- A. CT
- B. PT
- C. Thrombin
- D. Clot retraction time
Explanation: Clot retraction depends largely on functioning and adequate numbers of platelets, so it can provide a rough assessment of platelet…
Correct answer: Clot retraction time- A. Kupffer cell
- B. Basophil
- C. Plasma cell
- D. B cell
Explanation: Kupffer cells, the fixed macrophages lining hepatic sinusoids, phagocytose immune complexes arriving through the portal blood.
Correct answer: Kupffer cell- A. Liver
- B. Damaged tissue
- C. Platelets
- D. Vascular endothelium
Explanation: Activated platelets produce thromboxane A₂, which promotes platelet aggregation and vasoconstriction during haemostasis.
Correct answer: PlateletsBlood and Immunity MCQs: common questions
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There are 81 Blood and Immunity MCQs in the Physiology bank, shown 20 to a page with the correct answer and an explanation on each.
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