A pharmacist is asked to prepare 100 mL of a 1:5000 aqueous solution of benzalkonium chloride. What percent is the concentration that is being asked for?

A P50 measurement refers to which of the following?

a. The amount of oxygen diffusion in fluids b. The PO2 when hemoglobin is 50% satu-rated with oxygen c. The partial pressure of fetal hemoglobin at 50% saturation d. The partial pressure of oxygen consumed by the oxygen electrode

After a 29-year-old male with chest pain is removed from the house by stretcher, the man's 7-year-old son throws a temper tantrum. His mother is embarrassed and states that he has not done this since he was 2 years old. Given the situation, your response would be:

A) "I would not be concerned. This is a stressful event he doesn't understand, and he may just be having trouble coping with it." B) "You really need to correct this behavior now so it does not happen in the hospital. They will make you take him home." C) "It may be wise to contact your pediatrician and let him know about the temper tantrum. It may be controllable with medications." D) "A 7-year-old is too old for this type of behavior. You may want to talk to his pediatrician."