Which is most likely to lead to a major worldwide pandemic?
What will be an ideal response?
Worldwide pandemics are caused by influenza viruses that have undergone antigenic shift, because no human population has any immunity to them. In antigenic drift, where the changes are more gradual, a population will contain some people who are immune to some epitopes and some to others. Epidemics due to antigenic drift are usually relatively mild and limited.
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Which of the following activities will provide the MOST aerobic benefit for a beginning exerciser?
A. racquetball B. walking C. basketball D. tennis
Inappropriate methods of keeping weight low associated with bulimia nervosa include all of the following EXCEPT
A. vomiting. B. laxatives. C. excessive exercise. D. extremely low food intake.
Average pressure in glomerulus is around?
a. 30 mmHg b. 50 mmHg c. 70 mmHg d. 90 mmHg
Which of the following neurotransmitters is active in the descending pathways of synaptic transmission?
A. Beta-endorphin B. Serotonin C. Enkephalins D. Substance P