Which statement is true about dopamine?
a. dopamine discourages healthy behavior.
b. drug-addicted brains become used to tolerating higher levels of dopamine.
c. dopamine stimulates displeasure and lack of memory.
d. damage from addiction can be reversed.?

I think the correct answer from the choices listed above is option B. The statement that is true about dopamine would be that drug-addicted brains become used to tolerating higher levels of dopamine. It  is a neurotransmitter that helps control the brain's reward and pleasure centers.

20 times a minute is usually the average respritory rate of an adult. additionally the patient is breathing on his own, is clearly maintaining his airway, and is intaking a sufficient amount of air. you shouldn't use a bag valve mask, cpap, or other form of positive pressure ventilation, unless the patient has lost control of his airway, and is not breathing (apneic) or has rapid breathing or slow and shallow respirations. this patient would most likely and should be put on an non-rebreather mask or nrb attached to 100% high flow oxygen at 15 l/min. don't use a nasal cannula, as the amount of oxygen it provides is limited with a rate of 6 l/min.