Which of the Following Statements Regarding the Immune System Is

question 86

Multiple Choice

Which of the following statements regarding the immune system is TRUE?

• 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 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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