What Is the Speed of Light

question 97

Multiple Choice

What is the speed of light?

• A) 3.0 × 10⁸ cm/hour
• B) 3.0 × 10⁸ m/s
• C) 3.0 × 10⁸ mm/s
• D) 3.0 × 10⁸ mm/hour

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Definitions:

Cardiac Muscle Cells

Specialized muscle cells found in the heart that are responsible for generating the rhythmic contractions that pump blood through the body.

Actin

A globular multi-functional protein that forms microfilaments, playing a key role in muscle contraction, cell motility, and the cell's structural framework.

AV Node

The atrioventricular node is an element of the heart's conduction system that regulates heart rate by decelerating the electrical impulse prior to its transfer from the atria to the ventricles.

Action Potential

Change in membrane potential in an excitable tissue that acts as an electric signal and is propagated in an all-or-none fashion.