Immune System and Human Health



Health Perspectives:

  •  Early Greek and Ayurveda medicine viewed health as a balance of 'humors,' linking personality types to bodily conditions like fevers. 
  • William Harvey's discovery of blood circulation and the use of thermometers disproved these early ideas, shifting focus from 'humors' to scientific understanding. 
  • Biology later emphasized the impact of the mind on health, with neural and endocrine systems influencing the immune system. 


  • Health is not just the absence of disease or physical fitness; it's a state of complete well-being – physically, mentally, and socially. 
  • Good health enhances work efficiency, productivity, economic prosperity, and longevity while reducing infant and maternal mortality. 

Factors Influencing Health:

  • Genetic disorders, infections, and lifestyle factors like diet, rest, exercise, and habits affect health. 
  •  Maintaining good health involves a balanced diet, personal hygiene, regular exercise, and practices like yoga. 
  • Awareness, vaccination, waste disposal, vector control, and hygienic food and water resources contribute to good health. 


  • Diseases indicate adverse effects on organ/system functioning, manifesting in signs and symptoms. 
  • Diseases categorize into infectious (easily transmitted) and non-infectious (like cancer, a major cause of death). 
  • Drug and alcohol abuse negatively impact health.