3. Which of the following body systems are involved in the first line of defense of the immune system against infection? (1 point)
integumentary, digestive, respiratory
nervous, circulatory, skeletal
muscular, endocrine, urinary
urinary, skeletal, integumentary

Question

3.   Which of the following body systems are involved in the first line of defense of the immune system against infection?  (1 point)
		integumentary, digestive, respiratory
		nervous, circulatory, skeletal
		muscular, endocrine, urinary
		urinary, skeletal, integumentary

petiteme · Answer

It is integumentary, digestive, respiratory. The first line of defense consists of the physical barries, the chemical barriers then the microbes that helps our skin.