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

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 15. Body fluids and criculations4 Marks
MCQ
Impulse of heart beat originates from
  • ✓
    $SA-$node
  • B
    $AV-$node
  • C
    Vagus nerve
  • D
    Cardiac nerve
✓

Answer

Correct option: A.
$SA-$node
a
$SA-$node (sino-atrial node) is a group of specialized cardiac muscle cells, which have the property of generating rhythmic excitatory waves. It is also called pacemaker of the heart as it generates the wave for all the chambers of heart to contact.

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