109k views
1 vote
These lymphocytes need help recognizing an antigen. This 'help' is provided by a macrophage or other phagocytic:

a) T cell
b) B cell
c) Helper T cell
d) Natural killer cell

1 Answer

3 votes

Final answer:

Helper T cells require assistance from antigen-presenting cells like macrophages to recognize antigens. Macrophages provide this 'help' by presenting antigens on their surface with MHC proteins, facilitating T cell activation.

Step-by-step explanation:

A macrophage, which is a phagocytic cell, provides this 'help' by digesting pathogens and displaying part of the pathogen on its surface with the help of Major Histocompatibility Complex (MHC) proteins; thus functioning as an antigen-presenting cell. Helper T cells, upon interacting with these antigens, become activated and can then facilitate the activation of other immune cells, including B cells and cytotoxic T cells. In contrast, Natural killer cells do not require such help as they are capable of recognizing and killing cells that do not express 'self' proteins or that contain abnormal markers.

User Hellboy
by
7.3k points