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.
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.
Because it starts each heartbeat and sets the pace for the whole heart.
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.
Because it rhythmically forms impulses to initiate each heartbeat
The SA node is called the pacemaker because it randomly generates electrical impulses that stimulate the heart to contract (beat)
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
The sinoatrial, or SA, node is known as the pacemaker of the heart. There are other potential pacemakers if the SA node fails, but it is the main pacemaker.
The SA node is the "pacemaker" of the heart. Cells in the SA node are called "pacemaker" cells and they direct the contraction rate of the entire heart by generating action potentials.
The primary pacemaker of a normal healthy heart is the sinus node (or SA node). It is located in the right atria of the heart.
The heart's "pacemaker" is the SA (sinoatrial) node.
The primary pacemaker of the mammalian heart is the sino-atrial node. If the SA node fails, the atrioventricular node (AV node) takes over pacemaking.
SA node (Sinus Node)
The SA Node.
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.
No, the purkinje fiber is not the natural pacemaker. The sinoatrial node (SA node) is the natural pacemaker of the heart.
SA node (Sinus Node)
yes
sinoatrial node (SA)