Question
Rate of heart beat is determined by :
AV-node
SA-node
Purkinje fibres
Papillary muscles
Solution
C.
Purkinje fibres
Purkinje fibres are also called nodel tissue. It is a bundle of specialized cardiac muscle fibres. It receives rhythmical impulses of electrical excitation from the pace-maker and spreads the waves of contraction through the ventricle walls.
