Identify the first line of defence from the given options
Identify the first line of defence from the given options
The correct option is C 1, 2, 4
The various organs, chemicals and reactions occurring in our body that help in defending pathogens and toxins are called the immune system. Body has three lines of defences to fight against diseases. They are the first, second and the third line of defence.
First line of defence: It includes the physical barriers and the secretions. Skin, mucous membranes, lysozyme in tears, HCl in the stomach, oil on the skin etc. are the first line of defence. It prevents the entry of pathogens.
Second line of defence: Once the pathogen crosses the first line of defence they will be encountered by the second line of defence. It includes the cellular barriers (phagocytes, neutrophils, eosinophils), fever, inflammatory response etc. They are also non-specific.
Third line of defence: It is a pathogen specific immune response against the pathogen. Lymphocytes, memory cells are mainly involved in this. It is otherwise called adaptive /acquired immunity.
The various organs, chemicals and reactions occurring in our body that help in defending pathogens and toxins are called the immune system. Body has three lines of defences to fight against diseases. They are the first, second and the third line of defence.
First line of defence: It includes the physical barriers and the secretions. Skin, mucous membranes, lysozyme in tears, HCl in the stomach, oil on the skin etc. are the first line of defence. It prevents the entry of pathogens.
Second line of defence: Once the pathogen crosses the first line of defence they will be encountered by the second line of defence. It includes the cellular barriers (phagocytes, neutrophils, eosinophils), fever, inflammatory response etc. They are also non-specific.
Third line of defence: It is a pathogen specific immune response against the pathogen. Lymphocytes, memory cells are mainly involved in this. It is otherwise called adaptive /acquired immunity.
