Which of the following are components of the innate immune system

Which of the following are components of the innate immune system

Which of the following are components of the innate immune system? (Select all that apply)

A. Neutrophils

B. Macrophages

C. B lymphocytes

D. Natural killer (NK) cells

E. Complement system

Answer: ABDE

Explanation: The innate immune system is the first line of defense, consisting of non-specific components: neutrophils, macrophages, NK cells, complement system, skin, and mucous membranes. B lymphocytes are part of the adaptive immune system (specific immunity).