medical MCQs – Page 249

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 Review each marked answer and report any item that may be outdated or unclear.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

4961. Surfactant is secreted by_____________?
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A. Pnemocyte I

B. Goblet cells

C. Pulmonary vessels

D. Pnemocyte II

4962. Regarding Golgi tendon organ true is ______________?
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A. Sense muscle tension

B. Involved in reciprocal innervation

C. a- motor neuron stimulation

D. Senses dynamic length of muscle

4963. The major sign of hypoventilations_____________?
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A. Hypercapnia

B. Hypoxia

C. Cyanosis

D. Dyspnea

4964. At what temperature blood is stored______________?
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A. 6C

B. 8C

C. 4C

D. -4C

4965. Hemostasis depends upon all the following, EXCEPT_______________?
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A. Calcium

B. Vitamin B

C. Vitamin K

D. Prothrombin

4966. Thromboxane is produced mainly by _______________?
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A. Damaged tissue

B. Liver

C. Platelets

D. Vascular endothelium

4967. In excitable cells, repolarization is closely associated with, one of the following events_______________?
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A. K efflux

B. Na effux

C. K influx

D. Na influx

4968. Embryonic hemoglobin is composed of________________?
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A. Epsilon and gamma

B. Gamma and alpha

C. Gamma and beta

D. Alpha and beta

4969. The part of nephron least permeable to water is______________?
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A. Collecting tubule

B. Proximal tubule

C. Descending limb of loop of Henle

D. Ascending limb of loop of Henle

4970. Cardiac muscle contracts due to______________?
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A. Extracellular Ca+2

B. Sarcoplasmic ca+2

C. Extracellular Na+

D. Intracellular Na+

4971. To preserve blood for transfusion later______________?
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A. Dilute with equal volume of 0.9% saline

B. Add solution of sodium citrate

C. Add fibrinogen

D. Add solution of calcium chloride

4972. Skeletal muscles______________?
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A. Contracts when actin and myosin filaments shorten

B. Contraction is initiated by calcium binding to troponin

C. Contracts when calcium is taken up by sarcoplasmic reticulum

D. Contraction is initiated by calcium binding to tropomyosin

4973. True statement regarding hematopoiesis includes______________?
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A. None

B. Committed stem cells differentiates into only one cell type

C. Spleen plays a major role in adults (in lymphopoiesis )

D. RES plays a role

4974. Succinyl choline acts to block neuromuscular transmission by_______________?
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A. Blocking the release of acetyl choline at the end plate

B. Depolarizing the motor end plate of skeletal muscle

C. Inhibiting cholinesterase

D. Inhibiting the CNS

4975. The quantity of water lost in expired air each 24 hrs is about___________?
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A. 800 ML

B. 200 ML

C. 400 ML

D. 600 ML

4976. The alveolar ventilation in an individual with tidal volume: 600 ml, dead space 150 ml and respiratory rate of 15/ minute is_____________?
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A. 6.75 Lit/Min

B. 4.0 lit /Min

C. 9 Lit/Min

D. 2.5 lit/Min

4977. Which one of the following is a regulatory protein of the muscle ?
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A. Troponin

B. Protein- C

C. Myosin

D. Actin

4978. Two major types of muscle fibres are found in humans_____________?
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A. White and yellow

B. White and red

C. White and gray

D. white and brown

4979. CO2 is transported in plasma as_____________?
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A. CO

B. Carbomino compounds

C. Dissolved

D. Bicarbonate

4980. Small lymphocyte is _____________?
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A. None of these

B. Same as the size of RBC

C. Bigger than RBC

D. Smaller than RBC

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