Exogenous antigen is usually taken up by antigen-presenting cells through phagocytosis, processed, and presented to t cells on their surface by these:

- dendritic cells

- macrophages

- langerhans cells

- B cells

Explanation:

- The main function of dendritic cells is processing antigen materials and present it on the cell surface to the T cells of the immune system.

- Langerhans cells belongs to the skin immune system and are members of the dendritic cells residing epidermis.

- Macrophages are specialized cells that destroy target cells after recognizing them.

- B cells are a type of white blood cells that secret antibodies.

question 1: paragraph 3

question 2: paragraph 2

question 3: paragraph 1

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