In a Research Study in Which the Ingestion of Caffeine

question 85

Multiple Choice

In a research study in which the ingestion of caffeine pills is used to study the metabolic rate of sugar, which variable is the dependent variable?

• A) appetite
• B) caffeine pills
• C) judgment
• D) metabolic rate of sugar

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Definitions:

Pharynx

The membrane-lined cavity behind the nose and mouth, connecting them to the esophagus, part of the digestive and respiratory systems.

Respiratory Rate

The number of breaths taken per minute, an important vital sign indicating the efficiency of the respiratory system.

Carbon Dioxide

A colorless, odorless gas produced by burning carbon and organic compounds and by respiration, and absorbed by plants in photosynthesis.

pH

A numerical scale used to specify the acidity or basicity of an aqueous solution, where 7 is neutral, values less than 7 are acidic, and values greater than 7 are basic or alkaline.