The Direction of the Impulse Through the Conduction System of the Heart

question 232

Multiple Choice

The direction of the impulse through the conduction system of the heart for each cardiac cycle is normally

• A) AV node-SA node-bundle of His-Purkinje fibers.
• B) AV node-bundle of His-SA node-Purkinje fibers.
• C) bundle of His-AV node-Purkinje fibers-SA node.
• D) SA node-AV node-bundle of His-Purkinje fibers.
• E) SA node-bundle of His-Purkinje fibers-AV node.

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Crystal Form

The external shape displayed by a crystal or a mineral, determined by the internal arrangement of its atoms or molecules.

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1. The tendency of minerals to break along specific orientations of closely spaced planes. 2. The tendency of a rock, especially a metamorphic rock, to split along mostly parallel planes.