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Your skin is the first line of defense.
the integumentary system is the skin and the bodys first line of defense.
when it gets past the first line (the skin)
its killer T cells
The skin is the "first line of defense".
Lysozymes
The first line of defense includes the skin, breathing passage, mouth and stomach.
first
The first line of defense includes the skin, breathing passage, mouth and stomach.
skin and mucous membranes first line of defense second line-leukocytes and macrophages, inflammation and fever third is immune system
Skin
Your skin is the first line of defense.