The body can be described as having three distinct lines of defense; first, second, and third. Describe one component of one of these categories (first, second, or third line of defense) and how it helps the body ward off pathogens.

The body can be described as having three distinct lines of defense

The body can be described as having three distinct lines of defense; first, second, and third.

Firstly, describe one component of one of these categories (first, second, or third line of defense) and how it helps the body ward off pathogens.

More details;

In this lesson we’ll be learning about the specific immune system, which is the third line of defense in the body against pathogens. In this lesson, we’ll explore what cells are involved and also how they do their jobs.

What Is the Immune System?

Think of your body as a fortress. Inside, precious cells work day and night to keep you alive. Outside the castle gates lurk dangers, like bacteria and parasites, waiting to come in and take advantage of your resources. The castle walls keep most invaders out, but some sneak through. The ones that penetrate the outer walls might get caught in the moat. However, in the unlikely event something makes it through the outer defense system, there are soldiers on guard ready to fight.

These systems are analogous to the immune system in your body. Your immune system is a collection of cells and tissues that defend your body against invaders. Like the outer walls and moat, your body has non-specific defenses that protect your body against all invaders, including your skin, certain chemicals, and cells that are on guard patrolling your body.

If pathogens do get through, your body activates the third line of defense, which is your specific immune system. Your specific immune system is made of white blood cells called lymphocytes: B-cells and also T-cells. These cells recognize the pathogen invading specifically, compared to the second line of defense, which is activated by any pathogen. Your lymphocytes mount a defense system that is catered to that particular invader.

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