Match to its function. v helps T cells mature A. tonsils v cleanses the blood B. thymus C. lymph nodes v cleanses the lymph fluid D. spleen helps guard the entrance into the digestive and repiratory tracts E. pancreas

Helper T cells can be activated by macrophages(which engulf everything indiscriminately) or by B cells (which only engulf antigens that stick to their receptors).  A. What properties so macrophages and B cells have ibn common that allows them both to activate T cells? B. It has been suggested that macrophages probably do most to fhte T cell activating in the primary response but B cells do most of it in the secondary response. Why does this make sense?

The immune system includes the various responses the body uses to ensure survival in the presence of disease-causing agents. Identify the example of innate immunity.   A. Infected host cells are killed by toxic proteins from cytotoxic T cells.   B. Toll-like receptors bind to foreign molecule fragments to initiate immune response.   C. CD4 accessory proteins on the helper T cell surface bind to class II MHC molecules.   D. IgE antibodies recognize and attach to pollen grains, stimulating an allergic reaction.

Explain why each choice (a-d) is correct or incorrect.  In order for an antigen to activate or sensitize a T helper cell, the antigen must be a. coated with antibodies b. displayed on the surface of an APC along with MHC antigens c. displayed on the surface of another T cell with IgD antibodies d. partly digested by a natural killer cell

Which of the following is TRUE regarding Gram negative bacteria? a- Their cell wall is composed of a large proportion of sugars b- Their cell wall does not absorb the Gram stain and turns pink c- Their cell wall is composed of a small proportion of peptidoglycan d- Two of the above statements are true Which T-lymphocytes activate the B-cell response? 1- suppressor T-cells. 2- cytotoxic T-cells. 3- helper T-cells. 4- memory T-cells. Substances that are injected containing an antigen to stimulate the immune system to respond are called a- antibodies b- medications. c- vaccines d- antibiotics

B cells always need helper T cells to stimulate them to make antibodies.A. TrueB. False

8. Match each term with the correct definition. Each term is only used once.                                                                                                                                                                 Myeloid progenitors                                                                                                                                                                 Lymphoid progenitors                                                                                                                                                                 Monocytes                                                                                                                                                                Macrophages                                                                                                                                                                Eosinophils…

With the aid of a hand drawn diagram, briefly explain how T cells are primed or activated by B cells. In your response, briefly outline the major differences between B and T cell activation

Match the lymphoid tissue to its function. Some answers may be used more than once. Some questions may have more than one correct response. 1. Transfers excess fluid in the blood to the lymphatic system2. Matures T cells3. Defends against pathogens entering the mouth or nose4. Protects against pathogens in the urinary tract5. Filters lymph a. Thymus glandb. Lymph nodesc. MALTd. Spleene. Tonsils

Match the following: