Which Statement Best Describes Why Clinicians Use a Defibrillator

question 114

Multiple Choice

Which statement best describes why clinicians use a defibrillator?

• A)A defibrillator takes the place of the SA node and must be applied every minute to keep the heart rate normal until it regains its strength and beats on its own.
• B)The applied current opens up voltage gated calcium channels in the atria causing the heart to begin a new P wave.
• C)The applied current depolarizes all the muscle cells at the same time, returning synchronous electrical activity to the heart.
• D)The applied current repolarizes the cells of the heart, hence resetting the heart for normal rhythm.
• E)The ventricles of the heart are so large that only a strong current can make them depolarize, which is needed in order for them to contract and get blood to the body.

---

Definitions:

Marginal Revenue Product

The additional revenue generated by one more unit of input, such as labor or capital, in the production process.

Marginal Product

The increase in output that arises from an additional unit of input, holding all other inputs constant.

Profit-Maximizing Firm

A business entity's objective of adjusting production and sales to achieve the highest possible profit levels.

Wage Rate

The amount of money a worker is paid per unit of time, such as an hour or a month.