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Circulation MCQs for MDCAT Practice

Biology section, Circulation chapter. Up to eight free sample questions, each with the correct answer and a worked explanation. The full chapter opens in the app.

The bank has 912 active questions on this chapter. Your first 500 practice attempts are free, and every attempt includes a worked explanation.

  1. Question 1
    The massive accumulation of blood within the tissue is called:
    • Hemaaceal
    • Hematoma (correct answer)
    • Hemorrhage
    • Hepatoma
    Correct answer: B
    This question tests your understanding of medical terminology related to blood accumulation in tissues, specifically differentiating between a hematoma and other bleeding-related terms.
  2. Question 2
    Any hardening, stiffening or loss of elasticity of arterioles is known as:
    • Atherosclerosis
    • Angina pectoris
    • Arteriosclerosis (correct answer)
    • Myocardial infarction
    Correct answer: C
    This question tests your understanding of vascular diseases, specifically differentiating between conditions affecting arterial elasticity and plaque buildup.
  3. Question 3
    Digitoxin is produced from:
    • Digitalis (correct answer)
    • Cinchona
    • Cactus
    • Dilbergia
    Correct answer: A
    Digitoxin, a cardiac glycoside used to treat heart failure, is derived from the leaves of the Digitalis plant (foxglove).
  4. Question 4
    The "O" blood group persons have normally
    • No antibodies
    • Antibodies A&B (correct answer)
    • Antibodies-B
    • Antibodies-A
    Correct answer: B
    Individuals with O blood type possess both anti-A and anti-B antibodies in their plasma, leading to universal donor compatibility.
  5. Question 5
    Blood phenotype AB have:
    • Anti A antibodies
    • Anti B antibodies
    • Both Anti A and B antibodies
    • Neither anti A nor Anti B antibodies (correct answer)
    Correct answer: D
    Understanding ABO blood group antigens and antibodies is crucial for predicting transfusion compatibility. Phenotype AB lacks both anti-A and anti-B antibodies.
  6. Question 6
    Lub sound of heart is produced by:
    • Contraction of the ventricles
    • Relaxation of the ventricles
    • Contraction of the atria
    • Closure of the atrioventricular valves (correct answer)
    Correct answer: D
    The first heart sound (Lub) is generated by the closure of the AV valves, preventing backflow of blood into the atria during ventricular contraction.
  7. Question 7
    Which blood group transfusion can be made without risk?
    • Group A to Group B
    • Group AB to Group O
    • Group A to Group O
    • Group B to Group AB (correct answer)
    Correct answer: D
    Understand blood group compatibility: Group B can donate to AB, but other combinations risk dangerous antigen-antibody reactions.
  8. Question 8
    With respect to blood, the composition of lymph can be expressed as:
    • No RBCs. No Platelets, Less proteins, Less calcium and phosphorus, Predominant corpuscles lymphocytes (correct answer)
    • No RBCs, No Platelets, Less proteins, More calcium and phosphorus, Predominant corpuscles lymphocytes
    • No RBCs, Less or no Platelets, Less proteins, Less calcium and phosphorus, Predominant corpuscles macrophages
    • No RBCs, less Platelets, Less proteins, Less calcium and phosphorus, Predominant corpuscles monocytes
    Correct answer: A
    Lymph differs from blood by lacking RBCs/platelets, having fewer proteins/minerals, and a predominance of lymphocytes.

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Read the full Circulation chapter notes: Circulation notes. Or browse every chapter.