Human Immunity and Physiology

The immune system is a complex system that is responsible for protecting us against infections and foreign substances. There are three lines of defence: the first is to keep invaders out, the second line of defence consists of non-specific ways to defend against pathogens that have broken through the first line of defence. The third line of defence is mounted against specific pathogens that are causing disease. The immune system is closely tied to the lymphatic system, with B and T lymphocytes being found primarily within lymph nodes. Tonsils and the thymus gland are also considered lymph organs and are involved in immunity. We often don't realize how effective the immune system is until it fails or malfunctions, such as when the lymphocytes are attacked by HIV in an AIDS patient.

 

The immune system is a complex system that is responsible for protecting us against infections and foreign substances. There are three lines of defence: the first is to keep invaders out, the second line of defence consists of non-specific ways to defend against pathogens that have broken through the first line of defence. The third line of defence is mounted against specific pathogens that are causing disease. The immune system is closely tied to the lymphatic system, with B and T lymphocytes being found primarily within lymph nodes. Tonsils and the thymus gland are also considered lymph organs and are involved in immunity. We often don't realize how effective the immune system is until it fails or malfunctions, such as when the lymphocytes are attacked by HIV in an AIDS patient.

  • The lymphatic system
  • Organs, Tissues and Cells of the Immune System
  • Immune Response Pathways
  • Autoimmune Disorders
  • Leukocytes
  • Infectious Organisms and Immunization

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