Respuesta :
When an individual's immune system responds to an appropriate antigenic stimulus during the course of daily activities, this is called: "naturally acquired active immunity."
What is immune system?
A vast network of organ, white blood cell, protein (antibodies), and chemicals make up your immune system.
Together, these components of your body's defense system guard you against external intruders (bacteria, virus, parasites, and fungus) that can lead to illness, disease, and infection.
The features of properly working immune system are-
- When your immune response is in optimal condition: Your immune system can distinguish between your own cells and chemicals that are external to your body when it is functioning properly.
- It energises, mobilizes, engages in combat with, and eradicates potentially harmful foreign invader microbes.
- After you've been exposed to pathogens, your immune system picks them up.
- Your body produces antibodies to defend you against certain particular pathogens.
- The process of receiving a vaccine is an illustration of this idea.
To know more about main function of the immune system, here
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