An Invitation to Health 16th Edition by Dianne Hales

تمرين 2

Which of the following statements about the immune system is false?
A) The immune system has two types of white blood cells: B cells, which produce antibodies that fight bacteria, and viruses.
B) Immune system structures include the spleen, tonsils, thymus gland, and lymph nodes located throughout the body.
C) Inoculation with a vaccine confers active immunity.
D) The effect of stress on the human immune system depends on whether you can control the stressor and on the mental effort required to cope.