In which part of the respiratory system does the exchange of oxygen and carbon dioxide take place?

You are assessing a 73-year-old male complaining of altered mental status and shortness of breath. The patient is conscious, but confused. He is breathing at a rate of 20 breaths per minute. His pulse is rapid and weak, and his skin cool and diaphoretic. An Emergency Medical Responder provides you with the following vital signs: pulse 136, respirations 20, blood pressure 168/88, and SpO2 at 89%

Family states that he is diabetic and takes insulin. He also has a history of hypertension, colon cancer, irregular heartbeat, and transient ischemic attacks (TIA). Which one of the following should you do next? A) Check the patient's blood sugar. B) Perform the secondary exam. C) Apply supplemental oxygen. D) Administer oral glucose.

The primary contribution of the Romans to medicine was their:

A) scientific approach to dissection B) development of the first vaccine C) focus on sanitation D) discovery of aspirin