What Is the Average Life Expectancy for Individuals Born Today

question 38

Multiple Choice

What is the average life expectancy for individuals born today in the United States?

• A) 69.6 years
• B) 72.6 years
• C) 75.6 years
• D) 77.6 years

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Definitions:

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.

Atria Contract

refers to the phase in the cardiac cycle when the atria (upper chambers of the heart) contract to push blood into the ventricles.