What starts the electrical activity of the heart?

Answer 1

The sinoatrial (SA) node (known as the heart's pacemaker) in the wall of the right atrium is where electrical signals originate and lead to contraction. It sets the rate of contraction; at rest this is about 70 to 80 bpm (beats per minute). The SA node causes the atria to contract (down from the top), forcing blood into the ventricles. The SA node can also be influenced by external sources (such as exercise, increased adrenaline, or drugs) that can increase or decrease the force of contraction (heart rate).

The atrioventricular (AV) node passes the electrical signals from the atria to the ventricles, then to the bundle of His. If the SA node is damaged, the AV node takes over its functions.

The bundle of His (also known as the atrioventricular bundle) is a tissue within the ventricular septum. It splits to form the right and left bundle branches. The bundle of His passes the electrical signals to the Purkinje fibers.

The Purkinje fibres pass the electrical signals to the myocardium (heart muscle) in the ventricles. The ventricles contract (up from the bottom), pushing blood into the aorta and pulmonary arteries.
Electrical conduction system of the heart is the class, a subclass of body part
SA Node (causes contraction of atria) to AV Node ( delay from SA to AV allows atria to contract before ventricles), to Bundle of His (atrioventricular bundle) where the fibers branch into twos and carry impulses down the center of the heart to both ventricles and at base of heartfurther branching into Purkinje Fibers, which trigger muscle fibers of ventricles to contract.

Answer 2

The thing that stimulates your heart is Singapore

Answer 3

SA node ( sanoturial node intiate the action potential ) ..

Answer 4

The Sinoatrial node (SA node) and the Atrioventricular node (AV node) under the control of the brain stem's medulla oblongatta.

Answer 5

because your inlove

Answer 6

The Brain

Answer 7

Veins