Question

__________ play(s) an important role in both humoral and cell-mediated immunity.

a. killer cytotoxic (CD8+) T cells
b. neutrophils
c. B lymphocytes
d. Helper T cells (CD4+)
e. all of the above play an important role in both humoral and cell-mediated immunity

Answer 1

d. Helper T cells (CD4+)

Step-by-step explanation:

There are two kinds of immune responses, innate and adaptative (humoral and cell-mediated):

• Innate immunity is the first barries the body has against invaders, most of their responses are non-specific and non-induced, but some use pattern recognition receptor to recognize invaders, some of the leucocytes that are involved in this response are neutrophils, macrophages, and NK killers.

• Adaptative immunity

Cell-mediated immunity (CMI) refers to protective mechanisms that are not characterized by antibody, this kind of immunity is responsible for detecting and destroying intracellular pathogens, tumor cells and delayed-type hypersensitivity reactions. This CMI is mediated by lymphocytes T, T helpers identifying endogenous antigens and stimulating Killer cytotoxic (CD8+) T cells that liberate perforating enzymes into the infected cells causing lysis.

Humoral immunity describes the kind of immunity in which antibodies are produced by B lymphocytes to target exogenous antigens. In this kind of response Helper T cells also play a role secreting cytokines to activate the appropriate B lymphocyte.

Hope you find this information useful! good luck!

Answer 2

Helper T cells (CD4+)

Step-by-step explanation:

In the case of hummoral immunity, Helper T cells help in the differentiation of B cells into plasma B cells . The plasma B cells are then involved in the production of antibodies for specific kind of antigens. In the case of cell-mediated immunity helper T cells are involved in releasing cytokines and help differentiate the T cells into cytotoxic T cells. In the case of cell mediated immunity, the affected cell undergoes the process of lysis.