a. Purkinje fibre

b. Bundle of His

solution – (a) purkinje fibre : these are specialized conducting fibres made up of electrically excitable cells . It allows the conduction system of the heart to make a synchronized contractions of the ventricles . It is located in the myocardium of the ventricle . (b) bundle of his : it is a group of fibers carrying electrical impulses through the centre of the heart . They are present in the wall of the right atrium