211. Where is the pace maker situated
A
In left auricle near opening of pulmonary vein
B
In right auricle near eustachain valve
C
On inter - auricular septum
D
On inter-ventricular septum
Answer :
In right auricle near eustachain valve
212. ECG is a measure of
A
Rate of heart beat
B
Difference in electric potential
C
Volume of blood pumped
D
Ventricular contraction
Answer :
Difference in electric potential
213.
The figure shows a human blood cell. Identify it and give its characteristics.
Blood Cell
Characteristics
a. Monocyte
Life span 3 days, produce antibodies
b. Basophil
Secrete serotonin, inflammatory response
c. B-lymphocyte
Form about 20% of blood cells involved in immune response
d. Neutrophil
Most abundant blood cell, phagocytic
A
a
B
b
C
c
D
d
Answer :
b
214. The active molecule that helps initiate the inflammatory response when mast cells degranulate is
A
perforin
B
histamine
C
heparin
D
insulin
Answer :
histamine
215. A specialised nodal tissue embedded in the lower corner of the right atrium, close to Atrio- ventricular septum, delays the spreading of impulses to heart apex for about $$0.1\,sec.$$ This delay allows
A
the atria to empty completely
B
blood to enter aorta
C
the ventricles to empty completely
D
blood to enter pulmonary arteries
Answer :
the atria to empty completely
216. Which one generates heart beat
A
Purkinje fibers
B
Cardiac branch of vagus nerve
C
SA node
D
AV node
Answer :
SA node
217. Study of blood circulation system is called
A
Angiology
B
Cardiology
C
Haematology
D
Osteology
Answer :
Angiology
218. Which type of white blood cells are concerned with the release of histamine and the natural anti- coagulant heparin?
A
Neutrophils
B
Basophils
C
Eosinophils
D
Monocytes
Answer :
Basophils
219. Sickle cell anaemia is characterised by
A
Leukemia
B
Polycythemia
C
Mental retardation
D
Haemolytic anaemia
Answer :
Haemolytic anaemia
220. Blood circulation take following course in heart of man
A
Left auricle-left ventricle - body - right auricle - right ventricle
B
Right auricle - left ventricle
C
Left auricle - left ventricle - lungs - right auricle - right ventricle
D
Voluntary contraction
Answer :
Left auricle-left ventricle - body - right auricle - right ventricle