. A 54-year-old man is admitted to the emergency department after being found lying in his yard near a running lawnmower on a hot summer day. His body temperature is 106°F, his blood pressure is...

. A 54-year-old man is admitted to the emergency department after being found lying in his yard near a running lawnmower on a hot summer day. His body temperature is 106°F, his blood pressure is normal, and his heart rate is 160 beats/min. Which set of changes is most likely to be present in this man?