medical MCQs – Page 365

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 Review each marked answer and report any item that may be outdated or unclear.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

7281. Which of the following events DO NOT occur in rods in response to light_______________?
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A. Decreased intracellular cGMP

B. Activation of transducin

C. Structural changes in rhodopsin

D. Opening of Na+ channels

7282. Increase in threshold level on applying subthreshold, slowly rising stimulus is known as ___________?
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A. Adaptation

B. Accommodation

C. Refractoriness

D. Electrotonus

7283. Hemostasis depends upon all the following, EXCEPT_______________?
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A. Prothrombin

B. Vitamin B

C. Vitamin K

D. Calcium

7284. In human the Hb is_______________?
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A. HbA

B. HbS

C. HbM

D. HbH

7285. The conversion of prothrombin to thrombin, the factor participate along with calcium is______________?
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A. Fibrin

B. Stable factor

C. Labile factor

D. Thromboplastin

7286. Preganglionic parasympathetic fibers are_______________?
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A. Sympathetic

B. Somatic only

C. Parasympathetic

D. Cholinergic

7287. Under resting condition the cardiac output is _______ L/ min ?
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A. 4.25

B. 5.25

C. 2.5

D. 9.5

7288. Ventricular muscle receives impulses directly from the_______________?
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A. Right and left bundle branches

B. Bundle of HIS

C. Purkinje system

D. AV node

7289. Absolute refractory period in heart______________?
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A. Longer than refractory period in skeletal muscle

B. Lasts till cardiac contraction

C. All of the above

D. A phase of cardiac cycle in which heart cannot be stimulated by any amount of stimulus

E. Corresponds with duration of action potential

7290. The first heart sound is produced by the_____________?
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A. Closure of the mitral and tricuspid valves

B. Closure of the aortic and pulmonary valves

C. Opening of the mitral and tricuspid valves

D. Opening of the aortic and pulmonary valves

7291. Which of the following increases turbulence in blood flow ?
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A. Decrease in density of blood

B. Decrease in velocity of blood

C. Reynolds number < 2000

D. Increase in diameter of blood vessel

7292. Wallenberg degeneration is seen in______________?
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A. Proximal cut end of nerve with cell body

B. Distal cut end of nerve without cell body

C. Both the free ends of the cut nerve

D. All are true

7293. First heart sound occurs during the period of________________?
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A. Isotonic contraction

B. Isotonic relaxation

C. Isovolumetric contraction

D. Isovolumetric relaxation

7294. Closure of aortic valve occurs before the following event_______________?
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A. Isovolumetric contraction

B. Pre-systole

C. Pre-diastole

D. Isovolumetric relaxation

7295. Coronary blood flow is usually predominantly controlled by_____________?
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A. Parasympathetic impulses

B. Sympathetic impulse

C. Hormones

D. Auto regulation

7296. Pain sensation from the lateral extremities is transmitted by________________?
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A. Spinocerebellar tract

B. Spino thalmamic tract

C. Dorsal column

D. Corticospinal tract

7297. Parasympathetic stimulation of heart causes______________?
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A. Increased AV node excitability

B. Decreased ventricular contraction

C. SA node decreases firing

D. Tachycardia

7298. The largest function of the total peripheral resistance is due to _________________?
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A. Venules

B. Arterioles

C. Capillaries

D. Precapillary sphincters

7299. Swallowing center is situated in_______________?
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A. Pons

B. MIdbrain

C. Cerebellum

D. Medulla

7300. Sympathetic stimulation causes ______________?
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A. All of the above

B. Sweat secretion

C. Arteriolar constriction

D. Ciliary muscle contraction

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