Which Structure in the Heart Initiates Action Potentials That Stimulate

question 65

Multiple Choice

Which structure in the heart initiates action potentials that stimulate contraction of the heart at a constant rate of about 100 beats per minute?

• A)Cardiac accelerator nerves
• B)Atrioventricular node
• C)Cardiovascular center
• D)Sinoatrial node
• E)Bundle of His

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Definitions:

MRP

Marginal Revenue Product; the additional revenue generated from employing one more unit of input or labor.

Derived Demand

Demand for resources derived from demand for the final product.

Final Demand

The demand for finished products by consumers, businesses, and the government, without any further processing or transformation.

Goods and Services

Represents the output of an economy, where goods are physical items and services are activities provided by others for benefit or pleasure.