Why Do AV Nodal Cells NOT Determine the Heart Rate

question 61

Multiple Choice

Why do AV nodal cells NOT determine the heart rate under normal circumstances?

• A) They depolarize slower than all other conducting fibers.
• B) They slow conduction of the wave of excitation.
• C) They depolarize faster than all other conducting fibers.
• D) The AV node is connected to the SA node, but not to other conducting fibers in the heart.
• E) As depolarization initiated in the SA node reaches the AV node, it leaves the AV node in a refractory state.

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Definitions:

Indifference Curve

A graphical representation in microeconomic theory of the combinations of two goods among which a consumer is indifferent.

Midterm Grade

An evaluative score or letter assigned to a student, reflecting their performance halfway through an academic term.

Horizontal Axis

In a graph or chart, the x-axis, representing the independent variable or the basis of comparison across the chart.

Indifference Curves

A graphical representation showing different combinations of two goods among which a consumer is indifferent.