What effect does negative G-force have on the body?

Negative G-force refers to the forces experienced when the body is subjected to acceleration in a direction opposite to the direction of gravity. This phenomenon occurs in scenarios like rapid descent in an aircraft or a quick maneuver during flight.

When negative G-force is applied, the body experiences a sensation of being lifted away from the seat, leading to a feeling of weightlessness or being "pulled out of the seat." This effect can put strain on the body, particularly affecting circulation and how blood moves within the cardiovascular system. At high levels of negative G, blood can pool in the upper body, which might lead to a variety of physiological responses.

In contrast, other options such as increasing blood pressure, pulling blood from the brain, or enhancing oxygen intake do not accurately describe the primary effects of negative G-force. While there may be indirect effects on blood circulation and oxygen delivery due to altered blood flow dynamics, these are not the defining characteristics of negative G-force impacts. Thus, the sensation of being pulled from your seat encapsulates the immediate and recognizable impact of experiencing negative G-force.