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True/False Questions


Lymph originates in blood capillaries that pick up tissue fluid.


Red bone marrow is the point of origin of all immune cells of the lymphatic system.


Mucous membranes prevent most pathogens from entering the body because of the stickiness of the mucus and the presence of lysozymes.


Interferons are secreted in response to bacterial infections.


Pus is made of dead neutrophils, macrophages, and other tissue debris from damages tissue.


Pyrogens act by increasing the set point for body temperature in the thalamus.


The antigenicity of a molecule is due to specific regions of it called haptens.


Interleukins are chemical signals by which immune cells communicate with each other.


Helper T cells respond only to epitopes attached to MHC proteins.


Cytotoxic T cells respond only to antigens bound to MHC-I proteins.


Clonal selection of T cells happens in the thymus.


Naive T cells can synthesize antibodies


Humoral immunity takes care of intracellular viruses, whereas cellular immunity takes care of extracellular viruses.


Memory B cells are found circulating mainly in the lymph.


Some antibodies against foreign antigens can react to similar self-antigens causing an autoimmune disease.

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