Which of the Following Statements Is True of the Immune

question 35

Multiple Choice

Which of the following statements is true of the immune system?

• A) Its machinery consists of billions of red blood cells.
• B) When a person is under stress, the levels of bacteria and viruses drop dramatically.
• C) Lower levels of natural killer (NK) cells in stressful situations indicate a weakened immune system.
• D) Stress increases the number of natural killer (NK) cells in the body.

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Definitions:

Continuous Variables

Variables that can take an infinite number of values within a given range, allowing for very fine distinctions.

Factor Analysis

An analytical method in statistics that identifies the basic variables, or factors, explaining the correlation patterns seen within a group of observed variables.

Factors

In the context of statistics and experimental design, variables that are manipulated or measured to determine their effect on an outcome variable.

Outcomes

The possible results or consequences of an experiment or study.