Heartbeats are affected by

Heartbeat is accelerated by

Heartbeat is accelerated by

Heartbeat is accelerated by

Heartbeat is accelerated by

The rate of heartbeat is regulated by the integrated activity of inhibiting and accelerating effects occuring in which part of the brain ?

The rate of heartbeat is regulated by the integrated activity of inhibiting and accelerating effects occuring in which part of the brain ?

In man, heartbeat is intiated by

Rate of heartbeat is determined by

Rate of heartbeat is determined by