The QRS Complex Represents

question 70

Multiple Choice

The QRS complex represents

• A) depolarization of the atria
• B) depolarization of the ventricles
• C) the AV nodal delay
• D) repolarization of the ventricles
• E) the time during which the heart is contracting

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Definitions:

Membrane Potential

Membrane potential is the electrical potential difference across a cell's plasma membrane, critical for transmission of nerve impulses and muscle contractions.

Oligodendrocyte

A type of glial cell that forms myelin sheaths around neurons in the CNS.

Myelin Sheath

A fatty layer surrounding nerve fibers, which increases the speed at which electrical impulses propagate along the nerve cell.

Axon

A long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses away from the neuron's cell body.