Regarding the release of ACTH from the anterior pituitary in a 24-year-old man who is a marathon runner, which of the following is the next step in the process?

Regarding the release of ACTH from the anterior pituitary in a 24-year-old man who is a marathon runner, which of the following is the next step in the process?

A cell within the body that secretes a chemical that acts locally on cells in their immediate environment and does not enter the blood stream describes which of the following?

A 48-year-old woman has a history of urinary retention and progressive neuromuscular weakness. CT scan does not reveal any abnormalities of the head and neck. Consideration for an edrophonium test is being undertaken by the treating physician. Which of the following statements is correct?

A 26-year-old woman with infertility and her 23-yearold husband with a history of bilateral undescended testicles desires to start a family. She is currently taking a fertility medication but is troubled by some unusual and troubling side effects. She experiences heat and cold intolerance and mood swings. She complains of visual changes, and this makes her depressed. Which of the following medications is she most likely taking?

A 59-year-old man with hypertension is taking a \beta-blocker (acebutolol). His most recent blood pressure is 120 / 78~mmHg. This agent is likely to alter which of the following laboratory values?