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STD 11 - 15. Body fluids and criculations — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 15. Body fluids and criculations1 Mark
MCQ
Pace maker is
  • A
    Instrument for measuring heart beat
  • B
    Instrument for measuring pulse rate
  • C
    $AV$ node that provides impulse for heart beat
  • ✓
    Sinu-auricular node that provides impulse for heart beat
✓

Answer

Correct option: D.
Sinu-auricular node that provides impulse for heart beat
d
The oxygenated and deoxygenated blood are forced into their respective ventricles through atrioventricular opening by the contraction of atria. The contraction of atria is initiated and activated by the sinoatrial node ($SA$ node) commonly called pacemaker. It spreads waves of contraction across the walls of atria via muscle fibres at regular intervals

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