Which of the following is true of the structures of the electrical conduction system?
A)The AV valve is the pacemaker.
B)In normal sinus rhythm,the electrical signal arises within the SA node.
C)The His-Purkinje system spreads the electrical system from the right atrium to the left atrium.
D)The purpose of the AV node is to increase the speed at which the cardiac impulse moves from the atria to the ventricles.

Question

Quizplus · Accepted Answer

In normal sinus rhythm, the electrical signal arises within the SA node, also known as the pacemaker of the heart. Choice A is incorrect as the AV valve is not involved in the electrical conduction system. Choice C is incorrect as the His-Purkinje system spreads the electrical signal from the atria to the ventricles, not from the right to the left atrium. Choice D is incorrect as the purpose of the AV node is to delay the impulse briefly in order to allow the atria to contract before the ventricles do, not to increase speed.

Which of the Following Is True of the Structures of the Electrical