3 years ago

The first line of defense involves which structure(s)? T-cells skin blood B-cells

2 answers:

4 0

The first line of defense is skin, since it is the epidermis (top layer of skin) that protects all internal fluids and structures.

Gemiola [76]3 years ago

3 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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