21. One of the following lies in the wall of right auricle
A. Purkinje fibers
B. bundle of his
C. SA node
D. Chordae tendinae
Answer: C
_______________________
22. Ventricular systole is stimulated by
A. SA node
B. AV valve
C. AV node
D. AV aperture
Answer: C
_______________________
23. The center for heartbeat regulation is
present in
A. Pons varolii
B. Cerebrum
C. Cerebellum
D. Medulla
Answer: D
_______________________
24. The duration of the ventricular diastole in
a normal cardiac cycle is
A. 0.3 s
B. 0.5 s
C. 0.4 s
D. 0.7 s
Answer: B
_______________________
25. Most active phagocytic white blood cells are
A. eosinophils and lymphocytes
B. neutrophils and monocytes
C. neutrophils and eosinophils
D. lymphocytes and macrophages
Answer: B
_______________________
26. Which type of white blood cells are concerned with the release of histamine and the natural anticoagulant heparin ?
A. Eosinophils
B. Monocytes
C. Neutrophils
D. Basophils
Answer: D
_______________________
27. Time interval between the closure of
semilunar valve and closure of AV valve is
A. 0.3 s
B. 0.5 s
C. 0.1 s
D. 0.7 s
Answer: B
_______________________
28. The wall of arteries and veins differ from
each other mainly w.r.t.
A. Tunica adventitia
B. Tunica media
C. tunica externa
D. Tunica intima
Answer: B
_______________________
29. The course of blood from the heart to the
lungs and back to the heart is called
A. Systemic circulation
B. Pulmonary circulation
C. Singe circulation
D. double circulation
Answer: B
_______________________
30. Superior mesenteric artery supplies blood to
A. Pancreas and ileum
B. Hepatic and gastric arteries
C. Both(1)and (2)
D. Stomach and proximal half of large intestine
Answer: A
_______________________
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