Final answer:
The signs and symptoms of severe systemic hypothermia include shivering, confusion, slow heart rate, and decreased blood pressure.
Step-by-step explanation:
The signs and symptoms of severe systemic hypothermia include shivering, confusion, slow heart rate, and decreased blood pressure. Hypothermia occurs when the body's core temperature drops significantly, which can lead to various symptoms. In severe cases, the body's circulation is affected, resulting in a decrease in blood pressure.