Question

explain healthy heart muscle impulse begins and how is it transmitted to all parts of the muscle so it may contract as a functional stneytium

Answer 1

In Healthy heart muscle impulse begins / generated in the SA node (specialized myocyte) which act as pacemaker, this impulse travel to AV node via 3 internodal pathway i.e. anterior, medial and posterior internodal pathway.

From AV node impulse travel through bundle of Hiss and divide into right and left bundle branches. Which further travel through Purkinje fiber to supply the ventrio myocytes.

The muscle of the heart are interconnected at intercalated disc and gap junctions. Hence, action potential propagate from one cell to another very fast. And hence heart act as functional stneytium.