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21 February, 11:16

The first line of defense involves which structure (s) ?

T-cells

skin

blood

B-cells

+2
Answers (2)
  1. 21 February, 12:21
    0
    The first line of defense is skin, since it is the epidermis (top layer of skin) that protects all internal fluids and structures.
  2. 21 February, 13:05
    0
    Skin.

    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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