Final answer:
Hypothermia occurs when the core body temperature falls below 35.0 °C (95.0 °F). Controlled hypothermia is a medical technique used to reduce the metabolic needs of the body and protect organs.
Step-by-step explanation:
Hypothermia occurs when the core body temperature falls below 35.0 °C (95.0 °F). When the body temperature drops well below normal, certain proteins that facilitate chemical reactions lose their structure and ability to function, causing the chemical reactions of metabolism to cease. Controlled hypothermia, a clinical term for an abnormally low body temperature, is intentionally induced in certain medical procedures to reduce the metabolic needs of the body and minimize damage to organs.