Dive into the structure and function of the immune system, covering lymphoid organs, key immune cells, and the roles of antibodies. Compare cell-mediated immunity (CMI) and humoral-mediated immunity (HMI) to understand how the body defends against pathogens.
Type I hypersensitivity reactions, such as allergies, involve IgE antibodies binding to mast cells, leading to histamine release.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immune System - Lymphoid Organs Cells Antibodies - CMI HMI
B-lymphocytes do not directly destroy virus-infected cells; they produce antibodies that neutralize pathogens.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immune System - Lymphoid Organs Cells Antibodies - CMI HMI
The spleen is a major lymphoid organ that filters blood-borne pathogens and contains lymphocytes and macrophages.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immune System - Lymphoid Organs Cells Antibodies - CMI HMI
The thymus gland is responsible for the maturation of T-lymphocytes, which are essential for immune responses.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immune System - Lymphoid Organs Cells Antibodies - CMI HMI
Antibodies recognize and bind to specific antigens, helping in immune defense by neutralizing or marking pathogens for destruction.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immune System - Lymphoid Organs Cells Antibodies - CMI HMI
Lymph nodes filter pathogens and foreign particles from lymph, helping in immune defense.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immune System - Lymphoid Organs Cells Antibodies - CMI HMI
Histamine is released by mast cells during allergic reactions and contributes to inflammation.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immune System - Lymphoid Organs Cells Antibodies - CMI HMI
B-lymphocytes produce antibodies in response to pathogens as part of the humoral immune response.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immune System - Lymphoid Organs Cells Antibodies - CMI HMI
Antigens are foreign substances (like pathogens or toxins) that stimulate an immune response; they are not produced by the immune system.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immune System - Lymphoid Organs Cells Antibodies - CMI HMI
In humans, B-lymphocytes mature in the bone marrow before they circulate in the immune system.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immune System - Lymphoid Organs Cells Antibodies - CMI HMI
The thymus is a primary lymphoid organ where T-lymphocytes mature before they become active in immunity.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immune System - Lymphoid Organs Cells Antibodies - CMI HMI
IgE antibodies are involved in allergic reactions by triggering the release of histamines from mast cells.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immune System - Lymphoid Organs Cells Antibodies - CMI HMI
