GENERAL ANATOMY
ANATOMY OF THE HEART
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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AV NODE-SA NODE-PURKINJE FIBERS-BUNDLES OF HIS
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SA NODE-AV NODE-PURKINJE FIBERS-BUNDLES OF HIS
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SA NODE-AV NODE-BUNDLES OF HIS-PURKINJE FIBERS
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AV NODE-SA NODE-BUNDLES OF HIS-PURKINJE FIBERS
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Detailed explanation-1: -The SA node starts the sequence by causing the atrial muscles to contract. That’s why doctors sometimes call it the anatomical pacemaker. Next, the signal travels to the AV node, through the bundle of HIS, down the bundle branches, and through the Purkinje fibers, causing the ventricles to contract.
Detailed explanation-2: -The SA (sinoatrial) node generates an electrical signal that causes the upper heart chambers (atria) to contract. The signal then passes through the AV (atrioventricular) node to the lower heart chambers (ventricles), causing them to contract, or pump. The SA node is considered the pacemaker of the heart.
Detailed explanation-3: -The electrical impulse travels from the sinus node to the atrioventricular node (also called AV node). There, impulses are slowed down for a very short period, then continue down the conduction pathway via the bundle of His into the ventricles.
Detailed explanation-4: -Step 1: Stimulation of the sinoatrial node. SA node. Step 2: Stimulation of the atrioventricular node. AV node. Step 3: Propagation to the AV bundle. AV bundle. Step 4: Splitting into the bundle branches. Step 5: Propagation up the Purkinje fibers (subendocardial conducting network)