The primary function of ________ is secreting cytokines that regulate/coordinate the immune system.
A. plasma
B. helper T cells
C. cytotoxic T cells
D. natural killer cells
Answer: B. helper T cells
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Opsonizing antibodies are those that function by:
a. attaching to the surface of pathogens and contributing to their destruction by the lytic action of complement. b. binding to and blocking surface receptors for host cells. c. attaching to the surface of pathogens and making the pathogens more amenable to ingestion by phagocytic cells. d. attaching to the surface of pathogens and contributing to their destruction by che-motaxis.
Up to 70% of travel-associated Gastrointestinal Diseases are caused by:
What will be an ideal response?
A child has a mild fever and a macular rash primarily on the torso. No lesions are evident in the mouth, and the child has not complained of pain. Which of the following diseases might the child have?
A. hand-foot-and-mouth disease B. three-day measles C. red measles D. dengue fever E. Rocky Mountain spotted fever
Humans become infected with Fasciola by
A. ingesting cysts on vegetation. B. consuming cysticerci in contaminated meat. C. ingesting water contaminated with eggs. D. the penetration of cercariae through the skin. E. the bite of infected mosquitoes.