When do helper T-cells develop into TH1 or TH2 cells?
Immediately after the binding of the CD4 receptor
Before autostimulation
After proliferation into a clonal population
After B cell activation
After proliferation into a clonal population
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Fusion inhibitor drugs for HIV and AIDS can only be administered ________
A) by inhalation B) orally C) subcutaneously D) topically
Answer the following statements true (T) or false (F)
1. Hertz measures the intensity or loudness of a sound. 2. Presbycusis refers to the loss of hearing as part of the normal aging process. 3. Tinnitus is a term meaning dizziness. 4. A ceruminosis is the excessive accumulation of earwax. 5. Otitis media is also called swimmer's ear.
Answer the following statement(s) true (T) or false (F)
1. "Years of potential life lost" refers to the difference between one's life expectancy and one's age at death. 2. A common human factor that leads to injuries is risk-taking behavior. 3. Motor vehicle injuries cost Americans $245 billion in 2009. 4. Motor vehicle injuries are the leading cause of severe brain injury in the United States. 5. Nearly 90 percent of all motor vehicle crashes are caused by bad driving behaviors, especially speeding.
Why are hormone therapies for cancer most often used with prostate and breast cancer?
A. Hormones promote the growth and spread of these cancers. B. Hormones interfere with the progression of these cancers. C. These cancers block the production of essential hormones. D. These cancers are caused by reduced hormone levels.