Final answer:
The Valsalva maneuver causes a large increase in blood pressure.
Step-by-step explanation:
The Valsalva maneuver causes a large increase in blood pressure. When a person performs the Valsalva maneuver, they forcefully exhale with their nose and mouth closed, which increases the pressure in the chest and abdomen. This increase in pressure affects the blood vessels and leads to an increase in blood pressure.