Question

Which of the following are part of the body’s first line of defense against pathogens?

A.
white blood cells

B.
red blood cells

C.
lymph nodes

D.
mucous membranes
Will medal and fan

Answer 1

@imqwerty can you help?

Answer 2

yea ofc its A B)

Answer 3

The answer is D. Pathogens will contact your mucous membranes before any of the other answers get a chance to do anything.

Answer 4

okay thanks

Answer 5

openstudy.com/updates/52d4411ce4b01e5fc1e08139

Your skin. First line of defense is the physical barrier of the skin....if the bugs can't get it they can't harm you. The next line is the innate immune system which is non-specific and involves white blood cells (natural killer cells, mast cells, macrophages etc) and the complement system. After that is the adaptive immune system which uses lymphocytes such as T- & B-cells in the classic antibody-antigen response.
Andrew · 3 years ago