Question

Physical lines of defense include (1 point) Responses skin, cielia, and mucous membranes. skin, cielia, and mucous membranes. hair. hair. nails. nails. teeth.

Answer 1

Physical lines of defense in the human body primarily include the skin, cilia, and mucous membranes. These components act as barriers to protect the body from pathogens and foreign substances. Hair, nails, and teeth do play a role in overall defense but are not generally classified as primary physical lines of defense. Therefore, the correct answer would be:

**Skin, cilia, and mucous membranes.**