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Respiration and Circulation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYRespiration and Circulation1 Mark
MCQ
Pacemaker of heart is …………………..
  • ✓
    SA node
  • B
    AV node
  • C
    His bundle
  • D
    Purkinje fibers
✓

Answer

Correct option: A.
SA node
SA node

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