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

question 26

Multiple Choice

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.

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Definitions:

Glia

Supportive cells in the central nervous system that provide support and nutrition, maintain homeostasis, form myelin, and participate in signal transmission in the nervous system.

Neurons

Specialized neurons within the nervous system that convey information via electrical and chemical signals.

Dead Neurons

Neurons that have ceased to function and cannot transmit signals due to damage or disease.

Dendrites

The branched extensions of a neuron that receive messages from other neurons and transmit them toward the cell body.