Why you call SA node as pacemaker?

Answer 1

The SA node normally functions as the pacemaker for the entire heart because its intrinsic rate is the fastest in the system. From the SA node, impulses spread out over the atria, causing them to contract.

Answer 2

SAnode is situated at posteriorly at the junction of the superior venacava with right atrium.these are called P-cells or pacemaker cells.these fibres normally can generate and discharge impulses more rapidly than any other pacemaker tissue and their rate of discharge determines the rate at which the hert beats .that is why SAN is called cardiac pacemaker.

Answer 3

Because it starts each heartbeat and sets the pace for the whole heart.

Answer 4

The SA node in the heart sends out electrical signals telling the heart to contract, thus making a heart beat. It is the pacemaker due to it creating the "pace" of the heartbeat.

Answer 5

Because it rhythmically forms impulses to initiate each heartbeat

Answer 6

The SA node is called the pacemaker because it randomly generates electrical impulses that stimulate the heart to contract (beat)

Answer 7

because it generates impulse for contraction of the heart when S-A node fails. The rhythm originated from this region is called the nodal rhythm