Final answer:
The human body's first line of defense against pathogens includes skin, eyelashes, and tears. Vaccination is not considered a part of the body's first line of defense.
Step-by-step explanation:
The human body's first line of defense against pathogens includes skin, eyelashes, and tears.
The skin acts as a physical barrier that prevents pathogens from entering the body. It has multiple layers and produces oils and sweat that can kill or inhibit the growth of certain pathogens.
Eyelashes serve as a protective barrier for the eyes. They help prevent foreign objects, including pathogens, from entering the eyes.
Tears contain enzymes and antibodies that can kill or inhibit the growth of pathogens. They also help flush out foreign substances from the eyes.
Vaccination is not considered a part of the body's first line of defense. Vaccinations help stimulate the immune system to produce specific antibodies to fight against specific pathogens, but they are not inherent physical barriers.
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