Electrical impulses travel down Bundle of His/Purkinje fibres resulting in which stage of the cardiac cycle? a. Sino atrial(SA) contraction
b. Diastole
c. Ventricular contraction
d. Atrial contraction

The correct answer is c.

Explanation:

The cardiac impulse spreads through a bundle of fibers that is a bridge between the atrioventricular node and the ventricular branches, called the bundle of His, supplied by branches of the right coronary artery and the anterior descending artery. The bundle of His is divided into 4 branches: the right and left branches and the latter is divided into the anterior left fascicle and the posterior left fascicle, from where the electrical impulse is distributed to the ventricles through a network of fibers that cause contraction ventricular cells called Purkinje fibers, triggering ventricular contraction. The AV bundle conducts the impulse from the atria to the ventricles. The right and left branches of the Purkinje fibers conduct the cardiac stimulus to all parts of the ventricles. Purkinje fibers or tissue are located in the inner ventricular walls of the heart, below the endocardium. These fibers are specialized myocardial fibers that conduct an electrical stimulus or impulse that intervenes in the heart's nerve impulse causing it to contract in a coordinated manner.

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