According to the remote pilot study guide, what is heatstroke?

Why: The study guide defines heatstroke as "a condition caused by any inability of the body to control its temperature," with onset sometimes recognized only upon complete collapse. The recommended prevention is drinking an ample supply of water at frequent intervals regardless of thirst, at a rate of about one quart per hour in severe heat stress.

• Invents a hypoglycemia (low blood sugar) mechanism; the study guide ties heatstroke to the body's thermoregulation failing, not blood sugar.
• Describes hyperventilation, a separate physiological hazard discussed earlier in the same chapter, not heatstroke.