Cardiovascular system
Check your score:
1. This is the reason why the SA node acts as heart’s pacemaker
(a) because it has a poor cholinergic innervation
(b) because it has a rich sympathetic innervation
(c) because of its capability of generating impulses
(d) because it generates impulses at the highest rate
2. This about second heart sound is incorrect
(a) it is occasionally split
(b) it is due to the closure of semi-lunar valves
(c) indicates the commencement of diastole
(d) it has a longer duration than the first sound
3. The
reason for the dicrotic notch on the aortic pressure curve is
(a) contraction of aorta
(b) closure of the aortic valve
(c) rapid filling of the left ventricle
(d) closure of the pulmonary valve
4. Rise
in the carotid sinus pressure leads to
(a) reflex
(b) reflex
(c) reflex bradycardia
(d) reflex tachycardia
5. Peripheral
vascular resistance can be best given by
(a) pulse pressure as it corresponds to aortic compliance and
stroke volume
(b) mean arterial pressure as it supplies blood to organs
(c) diastolic blood pressure as it leads to the decrease till
mid-thoracic aorta
(d) systolic pressure as it causes an increase in the descending
aorta
6.
Duration of the absolute period, i.e., when the whole of heart is in diastole
is
(a) 0.2 seconds
(b) 0.1 seconds
(c) 0.4 seconds
(d) 0.7 seconds
7. This
sets glomerular capillary pressure apart from other capillaries found in the
body
(a) Lower filtration pressure
(b) Higher filtration pressure
(c) Both (a) and (b)
(d) none of these
8. The
ventricular muscles accepts impulses directly from
(a) AV node
(b) Bundle of His
(c) Right and left bundle branches
(d) Purkinje system
9. This
is the similarity between pulmonary and systemic circulation
(a) total capacity
(b) pulse pressure
(c) peripheral vascular resistance
(d) volume of the circulation per minute
10. On
the heart, the impact of adrenaline is all of these except that
(a) it increases the uptake of oxygen by the heart
(b) it increases the contraction force
(c) it decreases the myocardial irritability
(d) it increases the heart rate
answer:
1.d
2.d 3.b 4.c 5.c 6.a 7.b 8.d 9.d 10.c
THANK YOU!!!
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