Multiple choice

Which system is your bodies first line of defense against invasion and injury?

  1. Integumentary

  2. Endocrine

  3. Cardiovascular

  4. Nervous

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The integumentary system consists of the skin, hair, nails, and associated glands. It serves as the body's primary physical barrier, protecting internal tissues from physical trauma, pathogens, and dehydration.