Why Does the Superior Part of the Esophagus Contain Skeletal

question 217

Multiple Choice

Why does the superior part of the esophagus contain skeletal muscle instead of smooth muscle?

• A) The first phase of swallowing is under involuntary control.
• B) The second phase of swallowing is under voluntary control.
• C) The first phase of swallowing is under voluntary control.
• D) The second phase of swallowing is under involuntary control.

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Definitions:

Coefficient of Price Elasticity

A measure of the responsiveness of the quantity demanded of a good to a change in its price.

Demand Schedule

A table or graph showing the quantity of a product or service demanded at various prices.

Imperfectly Competitive Firm

A business operating in a market where it has some control over the price of its product because competition is not completely intense.

Marginal Revenue

The additional revenue that a firm receives from selling one more unit of a product.