21 February, 11:16
The first line of defense involves which structure (s) ?
21 February, 12:21
The first line of defense is skin, since it is the epidermis (top layer of skin) that protects all internal fluids and structures.
21 February, 13:05
The first being the outer barrier like skin, the second being non-specific immune cells like macrophages and dendritic cells, and the third line of defense being the specific immune system made of lymphocytes like B - and T - cells.
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» The first line of defense involves which structure (s) ? T-cells skin blood B-cells