GENERAL HISTOLOGY

Detailed explanation-1: -The second line of defence is a group of cells, tissues and organs that work together to protect the body. This is the immune system.

Detailed explanation-2: -First line of defense is also known as innate immunity. This immune system follows the non-specific form of defense mechanism against the pathogen. Second line of defense is also known as adaptive immunity. This immune system produces an immune response at the time when the human body is exposed to pathogens.

Detailed explanation-3: -Skin, tears and mucus are part of the first line of defence in fighting infection. They help to protect us against invading pathogens. You have beneficial bacteria growing on your skin, in your bowel and other places in the body (such as the mouth and the gut) that stop other harmful bacteria from taking over.

Detailed explanation-4: -The immune system’s three lines of defense include physical and chemical barriers, non-specific innate responses, and specific adaptive responses.