51. Pace maker is
A. Instrument for measuring heart beat
B. Instrument for measuring pulse rate
C. Auriculo - ventricular node that provides impulse for heart beat
D. Sino - auricular node that provides impulse for heartbeat
Answer : Option D
52. Pace maker is
A. Instrument for measuring heart beat
B. Instrument for measuring pulse rate
C. Auriculo - ventricular node that provides impulse for heart beat
D. Sino - auricular node that provides impulse for heartbeat
Answer : Option D
53. Which has the thickest walls ?
54. Prothrombin required for blood clotting is produced in
55. Contraction of right ventricle pumps blood into
A. Dorsal aorta
B. Pulmonary artery
C. Pulmonary vein
D. Coronary artery
Answer : Option B
56. Dub sound is produced during closure of
A. Semilunar valves
B. Bicuspid valve
C. Tricuspid valve
D. Both a & b
Answer : Option A
57. In circulatory system, valves occur in
A. Heart and blood vessels of both vertebrates and invertebrates
B. Both vertebrate and invertebrate hearts
C. Vertebrate heart only
D. Invertebrate heart only
Answer : Option A
58. In blood
A. WBCs are more than RBCs
B. RBCs are more than WBCs
C. RBCs are less than platelets
D. Platelets are less than WBCs
Answer : Option B
59. Pericardial fluid is secreted by
A. Myocardium
B. Parietal peritoneum
C. Visceral peritoneum
D. None of the above
Answer : Option C
60. Pulse pressure is
A. Diastolic pressure
B. Systolic pressure
C. Difference between b and a
D. Pressure in great veins
Answer : Option C