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Chapter 29 - The Immune System

Terms in this set (52)

the _______ is a widespread collection of cells and chemicals that defend the body against infections, cancer, and foreign substances.
immune system
the immune system defends the body against ______, or disease-causing agents (bacteria and viruses).
pathogens
The immune system also protects against ______.
cancer
______ have diverse functions in the immune system.
white blood cells
______, such as macrophages, engulf bacteria and debris.
phagocytes
______, such as B cells, T cells, and natural killer cells, coordinate immune responses and attack infected cells and cancer cells.
Lymphocytes
______ trigger inflammation, which is a fast response to injury or foreign substances.
Basophils
-collects fluid that leaks from blood vessels,
-removes bacteria, debris, and cancer cells,
-returns the liquid to the blood
lymphatic system
______ is the colorless fluid of the lymphatic system.
Lymph
______ absorb interstitial fluid and deliver it to larger lymph vessels.
Lymph capillaries
- lymph passes through ______, which remove foreign substances from lymph. Each ______ contains millions of lymphocytes.

- During infections or cancer, the ______ enlarge and may be sore.
lymph nodes
several ______ produce, accumulate, or aid in the circulation of lymphocytes.

- adenoids
- tonsils
- thymus
- spleen
- appendix
lymphoid organs
______ provide broad, nonspecific defense against any pathogen.
Innate defenses
In ______, immune cells recognize and remember specific pathogens (memory immune response).
adaptive immunity
______ form the first line of defense.
They prevent access or remove bacteria and viruses
- skin
- mucus
- ear wax
- tears
- stomach acid
Physical and chemical barriers
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