Question

explain the role of the body's normal defenses in preventing disease.

Answer 1

The human body tries to defend itself from diseases through natural barriers and immune system.

the skin, mucous membranes, tears, earwax, mucus, and stomach acid acts as the natural barriers against the micro organisms that cause infections.

The immune system acts to defend against infections through lymphocytes and antibodies.

The skin acts as a barrier against infections, injury and burn and help protect the underlying tissues and organs.

The mucous membrane lines the eye, nose, mouth. It traps the dirt and microorganism from entering the body and thus acts as a effective barrier.

The acid nature of the digestive bacteria helps in killing the harmful bacteria and maintains the healthy gut microbiota.

The acidity of urine helps in washing out of bacteria from urinary tract and thus prevent UTI.

When a foreign body enters the body immune system gets activated. It releases killer T cells and antibodies that recognizes and kills the invading micro organism.

Blood also contains neutrophils, monocytes, eosjnophils and basophils that attack the foreign cells and helps in their phagocytosis.