THORAX ABDOMEN AND PELVIS

MEDICAL

HEART AND PERICARDIUM

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

The conduction system uses an electrical signal, the message, known as the Action Potential(AP) to eventually make the heart contract. Where does the AP initiate at?

A	AV Node
B	Bundle of His
C	SA Node
D	Bachmann Branch

Explanation:

Detailed explanation-1: -The cardiac action potential is a measurement of the membrane potential waveform of the cardiac myocytes signifying the electrical activity of the cell during the contraction and relaxation of the heart. Specific ionic currents contribute to each phase of the cardiac action potential (see Fig. 24-10).

Detailed explanation-2: -Action potentials generated cyclically by the SA node spread around the right atrium and left atrium, causing them to contract, forcing their contents into the ventricles. This wave of depolarisation then reaches the atrioventricular node (AV node) which is the entry point for action potentials to the ventricles.

Detailed explanation-3: -The action potential generated by the SA node will travel through the right atrium and to the left atrium through Bachmann’s bundle, thereby depolarizing the atria and leading to atrial contraction.

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