Question

what is immune system

Answer 1

The immune system is a host defense system comprising many biological structures and processes within an organism that protects against disease. To function properly, an immune system must detect a wide variety of agents, known as pathogens, from viruses to parasitic worms , and distinguish them from the organism's own healthy tissue. In many species, the immune system can be classified into subsystems.
The immune system is made up of a network of cells, tissues, and organs that work together to protect the body. One of the important cells involved are white blood cells, also called leukocytes, which come in two basic types that combine to seek out and destroy disease-causing organisms or substances.

Answer 2

Immune System

• The immune system is a group of cells, proteins, tissues and organs that work together to protect the human body against foreign invaders or disease causing agents such as bacteria and viruses.
• The organs of the immune system include the lymphatic vessels, lymph nodes, tonsils, thymus, Peyer's patch and spleen.
• The system attacks and destroys these harmful substances through a series of steps known as immune response.
• Some parts of the immune system are antigen-specific and some are systemic. The antigen-specific immune system acts against a particular antigen, while the systematic parts work throughout the whole body.
• Some parts of the immune system have the ability to fight against antigen after they have fought it once.

$\rule{190}{1}$

Additional Information

Immunology

Immunology is a branch of biomedical science that studies the immune system in all organisms.

Immunization

Immunization is the process of making people immune to infectious organisms by administering vaccines.