How do the body’s exterior lines of defense prevent illness? (7th grade science)

a) they prevent pathogens from entering the body.
b) they make antibodies to protect against new pathogens.
c) they warn the body that pathogens have entered the body.
d) they cause fevers so that the body is too hot for pathogens to survive.

A

Explanation:

they prevent pathogens from entering the body because the human skin is made of a tough layer and is difficult to be penetrated by organisms. Even the mucous membrane (lines the digestive tract and respiratory tract) prevent pathogens from entering the body.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.