Humans are unique in their tendency to faint from fright, a trait not found in other animals. This response is due to a combination of factors: an upright stance and a large brain. When we experience a surge of emotion, such as fear, our blood pressure spikes, but afterward, it can drop too low, causing us to briefly lose consciousness. This phenomenon is attributed to the challenge of supplying blood to our brain, which requires a significant portion of our body's blood flow. Despite the potential for injury, fainting reflects the same traits that have enabled humans to thrive globally.
Vocabulary:
• Faint: to lose consciousness for a short time because of a temporary decrease in the blood supply to the brain.
• Surge: a sudden powerful forward or upward movement, especially by a crowd or by a natural force such as the tide.
• Veiny: full of or having many veins.
• Dip: a slight or temporary decrease or decline.
• Domination: the exercise of control or influence over someone or something, or the state of being so controlled.
• Traits: a distinguishing quality or characteristic, typically one belonging to a person.
Source: MinuteEarth