Why does Biting your tongue Get hurt but when biting your tongue on purpose doesn't hurt

True or false mucous membranes destroy pathogens on the outer body surface, at body openings.

Melanocytes and keratinocytes work together in protecting the skin from uv damage when keratinocytes a. provide the melanocyte with a protective shield against abrasion b. maintain the appropriate temperature so the product of the melanocyte will not denature c. maintain the appropriate ph in order for the melanocyte to synthesize melanin granules d. accumulate the melanin granules on their superficial portion, forming a uv-blocking pigment layer

Katie is in high school. what is the best example of how she can be proactive about her health and wellness