MICROANATOMY

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BLOOD CARDIOVASCULAR SYSTEM LYMPHOID ORGANS

CARDIOVASCULAR SYSTEM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The following are the components to the conducting system of the heart:1. Purkinje fibers2. AV bundle3. AV node4. SA node5. bundle branchesSequence the order in which electrical impulses would flow through-
A
3-5-4-2-1
B
4-2-3-5-1
C
4-3-2-5-1
D
3-2-4-5-1
Explanation: 

Detailed explanation-1: -This group of muscle cells is called the cardiac conduction system. The main parts of the system are the SA node, AV node, bundle of HIS, bundle branches, and Purkinje fibers.

Detailed explanation-2: -The components of the cardiac conduction system include (in correct sequence) the sinoatrial (SA) node, the atrioventricular (AV) node, the atrioventricular (AV) bundle, the atrioventricular (AV) bundle branches, and the Purkinje fibers.

Detailed explanation-3: -Atrioventricular node It is at the apex of a triangle formed by the tricuspid annulus and the tendon of Todaro, which originates in the central fibrous body and passes posteriorly through the atrial septum to continue with the eustachian valve (see the images below).

Detailed explanation-4: -The sino-atrial (SA) node. The atrio-ventricular (AV) node. The bundle of His. The left and right bundle branches. The Purkinje fibres.

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