CSS :: Circulatory System Physiology
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31. |
Bundle of His in mammalian heart extends through: |
A. |
Wall of right auricle via auriculo-ventricular aperture |
B. |
Wall of left auricle via left auriculo-ventricular aperture |
C. |
Interventricular septum |
D. |
None of these |
Answer: Option C
Explanation:
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32. |
Right fasciculum of bundle of His is: |
A. |
Cylindrical bundle made up of slender fibres |
B. |
Flattened and made up of band-like fibres |
C. |
Rounded with thick fibres |
D. |
None of these |
Answer: Option A
Explanation:
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33. |
The rate of conduction through bundle of His is: |
A. |
Fast |
B. |
Very fast |
C. |
Slow |
D. |
Very slow |
Answer: Option B
Explanation:
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34. |
Impulse passes through bundle of His at the rate of: |
A. |
1 mm per second |
B. |
3 mm per second |
C. |
5mm per second |
D. |
None of these |
Answer: Option C
Explanation:
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35. |
Pacemaker of the heart is situated: |
A. |
In the wall of right auricle close to Eustachian valve |
B. |
On interauricular septum |
C. |
On interventricular septum |
D. |
In the wall of left auricle close to the opening of pulmonary vein |
Answer: Option A
Explanation:
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36. |
SA-Node initiates heart beat in: |
A. |
Right auricle only |
B. |
Right auricle and partially in left also |
C. |
Right and left both |
D. |
Left auricle and partially in right also |
Answer: Option C
Explanation:
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37. |
Which of these structures is respobsible for conducting heart beat in rabbit's heart: |
A. |
Node of Tawara |
B. |
AV-Node |
C. |
Perkinjie fibre |
D. |
All of these |
Answer: Option C
Explanation:
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38. |
Neural control of heart beat is done by which of the following nerves: |
A. |
Parasympathetic fibres from vagus nerve |
B. |
Sympathetic fibres occurring in some spinal nerves |
C. |
Both of these fibres |
D. |
None of these |
Answer: Option B
Explanation:
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39. |
Which of these nerve fibres accelerate the rate of heart beat: |
A. |
Parasympathetic nerve fibres from vagus nerve |
B. |
Sympathetic nerve fibres from some spinal nerves |
C. |
Both (a) & (b) |
D. |
None of these |
Answer: Option B
Explanation:
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40. |
Slowing of heart rate in man is done by: |
A. |
Sympathetic nerve fibres by releasing noradrenaline |
B. |
Parasympathetic nerve fibres by releasing acetylcholine |
C. |
Sympathetic nerve fibres by releasing acetylcholine |
D. |
Parasympathetic nerve fibres by releasing noradrenaline |
Answer: Option B
Explanation:
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