medical MCQs – Page 241

Practise multiple-choice questions from medical for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

medical Mcqs

1. oral anatomy 2. microbiology 3. oral pathology and medicine 4. physiology 5. biochemistry 6. general anatomy 7. dental materials 8. pharmacology 9. pathology 10. oral histology

4801. The function common to neutrophils, monocytes & macrophages is______________?
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A. Immune response

B. Liberation of histamine

C. Destruction of old erythrocytes

D. Phagocytosis

4802. Histamine is present on surface of_______________?
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A. Neutrophils

B. Mast cells

C. Erythrocytes

D. Lymphocytes

4803. T- lymphocytes function to______________?
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A. Lymphokine production and delayed hypersensitivity

B. Antibody production

C. Immediate hypersensitivity

D. Complement activation

4804. the acrosome reaction occurs, when the sperm_____________?
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A. Comes in contact with zone pellucida

B. Penetrates cell membrane of oocyte

C. Penetrates corona radiate

D. Enters the uterine cavity

4805. Electromyography is used for________________?
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A. Determine the centric relation

B. To study muscle activity

C. Determine the centric occlusion

D. Determine class II malocclusion

4806. Amount of glucose absorbed in proximal convoluted tubule_______________?
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A. 100%

B. 0%

C. 60%

D. 50%

4807. Calcium ions triggers muscle contraction by binding to ___________________?
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A. Troponin

B. Actin

C. Tropomyosin

D. Myosin

4808. Hypoxia is characterized by ___________?
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A. Intense chemoreceptor response

B. All of the above

C. Low arterial PO2

D. Favorable response to 100% oxygen

4809. Which of the following events DO NOT occur in rods in response to light_______________?
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A. Activation of transducin

B. Decreased intracellular cGMP

C. Structural changes in rhodopsin

D. Opening of Na+ channels

4810. To measure renal plasma clearance compound should be_________________?
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A. Secreted by the tubules

B. Completely filtered by glomerulus

C. <70,000 Mol.wt

D. Bound to plasma protein

4811. In the human kidney, a renal papilla project directly into the_______________?
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A. Renal pyramid

B. Minor calyx

C. Major calyx

D. Ureter

4812. For heparin which of the following is ?
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A. Is released by mast cells

B. Is released by macrophages

C. Inhibits conversion of fibrinogen to insoluble fibrin

D. Interferes with action of thrombin

4813. Hemoglobin has______________?
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A. Four polypeptide chains, 2?, 1?,1? chain

B. One heme and one globin molecule

C. Four heme molecules and four polypeptide chains

D. Four heme molecules, 2? and 2? chains

4814. Which one of the following is not responsible for concentration of urine in the kidneys______________?
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A. Epinephrine

B. Vasopressin

C. Angiotensin II

D. Aldosterone

4815. The skeletal muscle action potential______________?
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A. Has a prolonged plateau phase?

B. Begins with an, in ward movement of K+ ins

C. Spreads in ward to all parts of the muscle via the t- tubule system

D. Is not essential for contraction to occur

4816. Which of the following is not a cause of secondary polycythemia ?
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A. High Altitude

B. Myeloproliferative changes

C. Pheochromocytoma

D. Cerebellar hemangioblastoma

4817. Which of them is not affected by vitamin K deficiency_____________?
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A. Factor II

B. Factor IX

C. Factor VII

D. Factor VIII

4818. Normal myeloid / erythroid ratio is______________?
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A. 1:1000

B. 3.513888889

C. 0.111111111

D. 1:50

4819. Inability of exchange of oxygen through lung tissue if known as____________?
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A. Histotoxic hypoxia

B. Anoxia

C. Anoxic anoxia

D. Ischemic hypoxia

4820. Normal prothrombin time is____________?
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A. 5-7 sec

B. 30 sec

C. 10-20 sec

D. 1 min

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