If Ectopic Impulses Are Occurring in the Heart at a Rate

question 19

Multiple Choice

If ectopic impulses are occurring in the heart at a rate that is faster than the SA node,

• A)the rate at which the SA node fires controls the ectopic rate.
• B)the ectopic beat overrides the SA node and causes the atria and ventricles to depolarize.
• C)the ectopic and SA node impulses cancel each other, resulting in atrial fibrillation.
• D)the SA node impulses control the atria, and the ectopic impulses control the ventricles.

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Definitions:

Income Elasticity

An indicator that shows the variation in demand for a product based on changes in the income levels of consumers.

Pro Football Games

Professional American football matches played by teams that are members of the National Football League (NFL) or other professional football leagues.

Normal Goods

Goods for which demand increases as the income of consumers increases and vice versa, showing a direct relationship between income and demand.

Demand Schedule

A list or table showing how much of a good or service consumers will want to buy at different prices.