physiology Mcqs
452. Hemostasis depends upon all the following, EXCEPT_______________?
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A. Prothrombin

B. Vitamin B

C. Vitamin K

D. Calcium

455. Preganglionic parasympathetic fibers are_______________?
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A. Sympathetic

B. Somatic only

C. Parasympathetic

D. Cholinergic
457. 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

458. 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

459. 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

460. 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
461. 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

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

B. Isotonic relaxation

C. Isovolumetric contraction

D. Isovolumetric relaxation

463. 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
464. Coronary blood flow is usually predominantly controlled by_____________?
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A. Parasympathetic impulses

B. Sympathetic impulse

C. Hormones

D. Auto regulation
465. 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

466. 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

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

B. Arterioles

C. Capillaries

D. Precapillary sphincters

468. Swallowing center is situated in_______________?
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A. Pons

B. MIdbrain

C. Cerebellum

D. Medulla
469. Sympathetic stimulation causes ______________?
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A. All of the above

B. Sweat secretion

C. Arteriolar constriction

D. Ciliary muscle contraction

470. 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

471. 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

472. 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

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

B. A-beta fibers

C. A-alpha fibers

D. A-gamma fibers

475. 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

476. 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

478. Neurotransmitter in nigrostrial pathway is_______________?
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A. GABA

B. Nor epinephrine

C. Acetyl choline

D. Dopamine
479. 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
480. 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

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

B. Heart rate

C. Systolic blood pressure

D. Venous return

485. 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

486. 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

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

B. Reflex Hypercapnia

C. Reflex hyperpnea

D. Reflex Hypercapnia
488. 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

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

B. Purkinje fibers

C. AV node

D. SA node

490. What is common between systemic and pulmonary circulation is_____________?
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A. Volume of the circulation per minute

B. Total Capacity

C. Peripheral vascular resistance

D. Pulse Pressure

491. Fastest conducting tissue in human heart _________________?
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A. Purkinje fibers

B. AV node

C. Bundle of His

D. SA node

492. Cardiac output is a measure of______________?
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A. Blood pressure X cardiac rate

B. Peripheral resistance X tissue fluid

C. Peripheral resistance X cardiac rate

D. Heart rate X blood volume
493. Abdominal visceral pain is transmitted by ________________?
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A. fibers

B. Sympathetic fibers

C. fibers

D. Parasympathetic fibers

494. Respiratory center is situated in_______________?
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A. Hypothalamus

B. Medulla oblongata

C. Midbrain

D. Spinal cord

495. In determining blood pressure by auscultatory method_____________?
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A. Systolic pressure estimation tends to be lower than those make by palpatory method

B. The first sound heard is the systolic pressure

C. The sounds that are heard are generated in heart

D. The loudest sound is the diastolic pressure

496. Satiety center in hypothalamus is regulated by ________________?
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A. Blood insulin levels

B. Blood glucose levels

C. Gastric dilatation

D. All of the above

497. Isovolumetric relaxation ends immediately after________________?
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A. When ventricular pressure falls below aortic pressure

B. When ventricular pressure falls below atrial pressure

C. None of the above

D. AV Valve closes

498. 2nd heart sound is characterized by all except______________?
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A. Marks the onset of diastole

B. Has longer duration than 1st heart sound

C. Is occasionally split

D. Due to closure of semilunar valves

500. Intensity of sound is measured in________________?
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A. Diopters

B. Daltons

C. Decibels

D. Pounds