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What happens after the SA node stimulates the atria to contract in the heart cycle?
After the SA node stimulates the atria to contract, the electrical impulse travels to the atrioventricular (AV) node, where it is briefly delayed. This delay allows the atria to fully contract and push blood into the ventricles. Following this, the impulse proceeds down the bundle of His and into the Purkinje fibers, causing the ventricles to contract and pump blood to the lungs and the rest of the body. This sequence ensures coordinated heartbeats and efficient blood flow.
What two chambers are stimulated immediately after the SA node depolarizes?
The two chambers that are stimulated immediately after the SA node depolarizes are the atria. The electrical signal spreads from the SA node to the atria, causing them to contract and pump blood into the ventricles.
Does the AV node initiates the contraction of the atria?
No, the sinoatrial (SA) node initiates contraction of the atria, which subsequently causes stimulation of the AV node, which then initiates contraction of the ventricles via the Purkinje fibers.
The SA node triggers an impulse that causes both atria to do what?
SA node sends an impulse for the atria to contract. AV node is then activated which contracts the ventricles.
What is the damage to the AV node totally or partially releasing the ventricles from the control of the sinoatrial SA node?
heart block
What structure conducts the contraction impulse from the atria to the ventricles?
the purkinje fibers um no!!! wrong answer!!
What starts the electrical activity of the heart?
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 partSA 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.
What carries electrical impulses across the heart and causes the ventricles contract?
SA node.
What would be a possible consequence of the SA node failing to depolarise?
the ventricles would not contract
How long does the AV node delay the signal from the SA node?
The AV node typically delays the signal from the SA node by about 0.1 to 0.2 seconds. This delay allows time for the atria to contract and fill the ventricles with blood before the signal is transmitted to the ventricles.
What part of the heart is responsible for causing the rhythmic contraction of the atria and the ventricles?
the sinoatrial (SA) node
The actual contraction of the ventricles of the heart is stimulated by?
Sinoatrial (SA) Node or "Pacemaker"
