A Group of Researchers Conducts a Study to Determine If

question 14

Multiple Choice

A group of researchers conducts a study to determine if children's performance is affected by the presence of other children. First, the children are taken to a room with no other children and timed while they complete a puzzle. Later, the same children are taken to a room with four other children and timed while they complete a similar puzzle. In this study, the length of time it takes to complete the puzzle would be

• A) the independent variable.
• B) an extraneous variable.
• C) a control variable.
• D) the dependent variable.

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Definitions:

Aortic Valves

The valve in the heart that controls blood flow from the left ventricle into the aorta.

Hemorrhagic Shock

A condition of reduced tissue perfusion, inadequate oxygen supply to the cells, often a result of severe blood loss.

Cardiac Output

The volume of blood the heart pumps through the circulatory system in one minute, typically measured in liters per minute.

Hypertrophy

The enlargement of an organ or tissue from the increase in size of its cells, commonly associated with increased muscle mass from exercise.