Lymphoid tissue is a cylinder of loosely organized cells surrounding the arteries. It is rich in lymphocytes and includes lymph nodes, spleen, tonsils, bone marrow and thymus. An appendix is a lymphoid organ which helps the body to stave diseases.
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Concepts Used:
Human Health and Disease
Health is described as a state of complete physical, mental and social well-being.
The disease is a circumstance where malfunctioning of the body organs occurs leading to uneasiness and discomfort.
Differences between Infectious Diseases and Non-Infectious Diseases: