medical MCQs – Page 366

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 Review each marked answer and report any item that may be outdated or unclear.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

7301. Absolute period when whole heart is in diastole is______________?
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A. 0.4 seconds

B. 0.3 seconds

C. 0.7 seconds

D. 0.7 seconds

7302. Consider the following statements________________?
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A. Starlings law of heart states that increase in force of contraction is directly related to cardiac ouput

B. Stalings law of heart states that the force of ventricular contraction is directly related to the end diastolic volume

C. Both A and B

D. None of the above

7303. Normally, the rate of the heart beat in a human is determined by _________________?
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A. The sinoatrial node

B. The cervical ganglion

C. All cardiac muscle

D. The bundle of His

7304. Cardiac output is maximum to _________________?
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A. Brain

B. Heart

C. Kidney

D. Liver

7305. Pain is conducted by________________?
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A. A-delta fibers

B. A-beta fibers

C. A-alpha fibers

D. A-gamma fibers

7306. Cardiac output in L/min divided by heart rate equals_______________?
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A. Cardiac efficiency

B. Mean stroke volume

C. Cardiac index

D. Mean arterial pressure

7307. The dicrotic notch on the aortic pressure curve is caused by_________________?
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A. Rapid filling of the left ventricle

B. Closure of the pulmonary valve

C. Closure of the aortic valve

D. Contraction of the atria

7308. Resting membrane potential of nerve fiber is_______________?
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A. -70 mv

B. -90 mv

C. -55 mv

D. + 35 mv

7309. Neurotransmitter in nigrostrial pathway is_______________?
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A. GABA

B. Nor epinephrine

C. Acetyl choline

D. Dopamine

7310. Starlings law of the heard________________?
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A. Does not operate in the failing heart

B. Explains the increase in cardiac output when the sympathetic nerves supplying the heart stimulated

C. Does not operate during exercise

D. Explains the increase in cardiac output that occurs when venous return is increased

7311. Cardiac index is related to ______________?
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A. cardiac output and body weight

B. Cardiac output and body surface area

C. Cardiac output and work of the heart

D. Stroke volume and pulse rate

7312. Distribution of blood flow is mainly regulated by the________________?
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A. Arteries

B. Arterioles

C. Capillaries

D. Venules

7313. Cardiac output is not affected by __________________?
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A. Peripheral resistance

B. Heart rate

C. Systolic blood pressure

D. Venous return

7314. Stroke output of each ventricle in normal adult is_____________?
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A. 30 ml

B. 130 ml

C. 70 ml

D. 5 liters

7315. Gag reflex is mediated by _______ cranial nerve ?
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A. X

B. IX

C. XII

D. VII

7316. Stimulation of baroreceptors results in_______________?
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A. Decrease in blood pressure

B. Increase in heart rate

C. Increased sympathetic discharge

D. Decreased vagal discharge

7317. The function of Carotid body is_______________?
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A. Measures the change in Po2 in arterial blood

B. Measures the change in CO2 in venous blood

C. Measures Po2 in venous blood

D. Measures the changed in CO2 in arterial blood

7318. Increase in carotid sinus pressure produces__________________?
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A. Reflex tachycardia

B. Reflex Hypercapnia

C. Reflex hyperpnea

D. Reflex Hypercapnia

7319. The term myopia refers to ______________?
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A. Constriction of the pupil

B. Far sightedness

C. Near sightedness

D. Dilation of the pupil

7320. Conduction velocity is least in_______________?
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A. SA node

B. Purkinje fibers

C. AV node

D. SA node

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