Which of the following happens in the first phase of the body's immune response?
A) Helper T cells identify the enemy and rush to the spleen and lymph nodes.
B) Natural killer T cells kill cells of the body that have been invaded.
C) The immune system recognizes the foreign substance or invader.
D) Phagocytes eat both antibody and invader.

Question

Quizplus · Accepted Answer

The first phase of the body's immune response is recognition, during which the immune system recognizes the foreign substance or invader. This triggers a cascade of events that lead to other immune cells being activated and recruited to the site of infection.

The other options are incorrect:

A) Helper T cells do play a role in the immune response, but they are not the first cells to identify the enemy. This is the job of other cells such as dendritic cells and macrophages.

B) Natural killer T cells are a subset of T cells that play a role in killing infected cells, but they do not kill cells of the body that have been invaded (as stated in the option).

D) Phagocytes do eat invading pathogens, but they do not eat antibodies. Antibodies are produced by B cells and are molecules that recognize specific foreign substances and help in their removal from the body.

Which of the Following Happens in the First Phase of the Body's