Answer:
Helper T cells are arguably the most important cells in adaptive immunity, as they are required for almost all adaptive immune responses. They not only help activate B cells to secrete antibodies and macrophages to destroy ingested microbes, but they also help activate cytotoxic T cells to kill infected target cells.
Explanation:
Helper T cells become activated when they are presented with peptide antigens by MHC class II molecules, which are expressed on the surface of antigen-presenting cells (APCs). Once activated, they divide rapidly and secrete cytokines that regulate or assist the immune response.
Answer:
cells
Explanation:
cells are responsible for the structures and functions
Activation energy - is the minimum quantity of energy that the reacting species must possess in order to undergo a specified reaction.
Answer:
D. Uncontrolled Cell Division
Explanation:
Fun Fact: Cancer can make mini cancer that can stack on top of itself.