During the menstrual period, the endometrium is sloughed off
Indicate whether the statement is true or false
True
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Sleeping sickness and Chagas's disease are caused by members of the genus Trypanosoma, protozoans that reside in the bloodstream. What is the principle way trypanosomes evade the immune response?
A. Antagonistic cytokines are produce by the trypanosome. B. Periodic changes in the surface antigen (VSG) of trypanosomes ensures that at least some cells will survive antibody mediate attacks. C. Trypanosomes are human pathogens and thus immune to human immune responses. D. Trypanosomes invade the brain and red blood cells so that immune effector cells such as macrophages and dendritic cells cannot phagocytize trypanosomes. E. Vaccines are readily available to people in trypanosome infested areas.
Rohypnol is the most publicized "date rape" drug
Indicate whether the statement is true or false
Which of the following is a sign of overtraining, overuse, and chronic fatigue?
A. performance decline despite increased work B. persistent soreness and stiffness in joints and muscles C. increased tension, anger, irritability D. increases of 6-8 beats per minute in morning resting pulse E. All of the answers are correct.
Antigen-presenting cells that activate helper T cells must express which one of the following on their surfaces?
a. IgE b. gamma interferon c. class I MHC antigens d. class II MHC antigens