GROSS ANATOMY
HEART MEDIASTINUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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AV node, SA node, Purkinje fibers, AV bundle of His, right and leftbundle branches.
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SA node, AV node, AV bundle of His, right and left bundle branches, Purkinje fibers
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SA node, Purkinje fibers, AV node, AV bundle of His, right and left bundle branches
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AV node, Purkinje fibers, AV node, AV bundle of His, right and left bundle branches.
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Detailed explanation-1: -Final answer: SA node → AV node → Bundle of His → Purkinje fibers represent the correct sequence of the origin and conduction of action potential.
Detailed explanation-2: -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-3: -Answer and Explanation: The correct answer is E. SA node, AV node, bundle of His, Purkinje fibres.
Detailed explanation-4: -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-5: -Membrane currents that generate the a normal action potential. Resting (4), upstroke (0), early repolarization (1), plateau (2), and final repolarization are the 5 phases of the action potential.