What functions do the alveoli serve in the lungs?
A) They prevent dust and pollen from entering the lungs.
B) They allow for the exchange of carbon dioxide and oxygen.
C) They ensure that air flows completely through the lungs.
D) They help to expand and contract the lungs.
B) They allow for the exchange of carbon dioxide and oxygen.
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Answer the following statements true (T) or false (F)
1. Use of tanning lamps is not linked to skin cancer, because tanning lamps emit a safe form of UV radiation. 2. Basal cell carcinoma is the most dangerous form of skin cancer. 3. Pancreatic cancer is usually detected after it has reached an advanced stage. 4. Early signs of cancer are typically apparent only to the person who has them.
Which of the following intracranial tumors has the best prognosis and is curable in most instances?
A. astrocytoma B. oligodendroglioma C. medulloblastoma D. meningioma E. glioblastoma multiforme
Chlamydia infection is the leading cause of _______________ in men under age 35.
A. epididymitis B. prostatitis C. urethritis D. testiculitis
Which of the following segments of the U.S. population has the highest rate of smoking?
A. Blacks B. Hispanics C. Whites D. Alaska Natives