During each cardiac cycle, prominent sounds are produced which can be easily heard through a stethoscope. They are

The frequency of heartbeat in our body is maintained by:

Heartbeat is controlled by a nodal tissue which is made up of specialised cardiac muscles,called

Explain in short: $Lub$ and $Dub$ sounds.

Blood pressure in the pulmonary artery is

............ can generate the maximum number of action potentials and is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Therefore,it is called the pacemaker.