True A+
Mucus, sweat, and tears
exogenous pathogens.
They transform themselves to lots of plasma cells, which create antibodies to fight against the pathogens.
Yes
fight against illnesses
Tears, saliva, skin, mucous membranes, and stomach acid
your body produces antigens to fight against the pathogens and imune you agaist diseases.
tears
Pathogens are the disease causing agent while antigens are found in the antibodies that fight against the pathogens. So in short, no they aren't the same.
Tears contain lysozymes, which are enzymes that are part of our natural defense to any pathogens that may be present. Lysozymes do what their name implies, they "lyse" any bacterial cells that may be on our face or around or eyes.
yes, tears prevent pathogens from entering the eye. when an irritation occurs the eye produces a salty liquid (tears) to clean the eye from any dust or pathogens. eyelashes also prevent pathogens and dust from entering. In terms of a chemical barrier, your tears contain the enzyme lysozyme which can disrupt the cell walls of gram-positive bacteria by digesting the peptidoglycan in them. This enzyme is also found in your saliva.
Your body's most important nonspecific defense is the skin. Other nonspecific defenses include mucus, sweat, and tears.