The role of the medical assistant in collecting blood specimens requires knowledge of each of the following EXCEPT ________.

Parasympathetic innervation of the penile arteries that release ________ at their synaptic knobs causes the smooth muscle in the arterial walls to relax, resulting in erection

A) proglandastin B) luteinizing hormone C) nitric oxide D) gonadatropin-releasing hormone

Which of the following is a characteristic of a preferred provider organization (PPO)?

A. It includes a contracted network of providers. B. Members select a primary care physician (PCP) as a gatekeeper. C. The plan is more restrictive than a health maintenance organization (HMO). D. Members must obtain referrals to see a specialist.