CBSE Class 12 Biology – Human Health and Disease

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12th

12th - Biology

Human Health and Disease

Chapter Overview

This chapter explores health as physical, mental, and social well-being, and describes multiple diseases—infectious, non-infectious, genetic, and deficiency disorders. Key systems include immunity (innate and acquired), vaccines, and societal measures to prevent and manage diseases like AIDS, cancer, drug abuse, allergies, and autoimmunity. :contentReference[oaicite:1]{index=1}

Important Keywords

  • Health: Complete physical, mental, and social well-being, not just absence of disease. :contentReference[oaicite:2]{index=2}
  • Disease: Abnormal condition affecting body structure or function.
  • Pathogen: Disease-causing agent (bacteria, virus, protozoa, fungi, helminths).
  • Immunity: Body’s ability to resist disease; includes innate and acquired immunity.
  • Vaccination: Introduction of antigen to develop immunity.
  • Autoimmunity: Immune response mistakenly attacks body's own cells.
  • Cancer: Uncontrolled cell growth forming tumors; metastasis is spread to other tissues.

Detailed Notes

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