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.
Correct Answer:
Verified
Correct Answer:
Verified
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