HUMAN PHYSIOLOGY
BODY FLUIDS AND CIRCULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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AV node, Bundle of His, SA node, Purkinje fibers, bundle branches
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SA node, AV node, Bundle of His, bundle branches, Purkinje fibers
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SA node, Bundle of His, AV node, Purkinje fibers, bundle branches
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SA node, Bundle of His, bundle branches, Purkinje fibers, AV node
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Detailed explanation-1: -The option that represents the correct path for the transmission of an impulse in the intrinsic conductions system of the heart is D. sinoatrial (SA) node, atrioventricular (AV) node, atrioventricular (AV) bundle (bundle of His), right and left bundle branches, Purkinje fibers.
Detailed explanation-2: -Answer and Explanation: The correct sequence is D, E, B, C, and A. The electrical impulse is generated by the Sinoatrial node in the right atrium. The electrical impulse then travels through the internodal pathways towards the Atrioventricular node.
Detailed explanation-3: -Thus, the correct sequence of the cardiac impulse is SA Node, AV Node, AV Bundle, Purkinje fibre.
Detailed explanation-4: -Sinoatrial (SA) Node It initiates the sinus rhythm, or normal electrical pattern followed by contraction of the heart. This impulse spreads from its initiation in the SA node throughout the atria through specialized internodal pathways, to the atrial myocardial contractile cells and the atrioventricular node.
Detailed explanation-5: -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.