
ORIGIN, CONDUCTION & REGULATION OF HEARTBEAT
Heart has intrinsic system whereby muscle contracts and relax without the involvement of brain. However, Intrinsic system can be stimulated or depressed by nerve impulses... Read more
Simplest Explanations of Complex Facts
Heart has intrinsic system whereby muscle contracts and relax without the involvement of brain. However, Intrinsic system can be stimulated or depressed by nerve impulses... Read more