CBSE/NCERT/Notes/Class_12_Biology
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Note on Human Health and Disease (Chapter 7)
Health is a state of complete physical, mental, and social well-being, and not merely the absence of disease or infirmity. It is maintained by a balanced diet, personal hygiene, and regular exercise (including Yoga).
Pathogens (bacteria, viruses, fungi, protozoans, etc.) cause diseases by entering and multiplying within the host.
Diagnosis of Typhoid Typhoid fever can be confirmed by Widal test. A classic case in medicine, that of Mary Mallon nicknamed Typhoid Mary, is worth mentioning here.
Why Chills occur in Malaria? The rupture of RBCs is associated with release of a toxic substance, haemozoin, which is responsible for the chill and high fever recurring every three to four days.
The ability of the host to fight disease-causing organisms.
Importance of Colostrum The yellowish fluid colostrum secreted by mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant.
Based on the property of 'memory'. Recombinant DNA technology allows for large-scale vaccine production (e.g., Hepatitis B from yeast).
Breakdown of regulatory mechanisms; loss of contact inhibition.
/CBSE/NCERT/Notes/Class_12_Biology/Chapter_07_Human_Health_and_Disease.mdx