Phalenar: "Remarkable Third Button": Remarkable Third Button Fainting episodes often begin in the same way and in the same situations as the well-known fight-or-flight response. When animals, including human animals, sense a possibly mortal threat, adrenaline and other hormones (called catecholamines) flood into our bloodstreams. Our hearts race. Our blood pressures soar. We breathe faster. Crucially, we get a burst of energy, allowing us to either escape from the threat or battle it off. But as you’ll soon see, the old duality of “fight or flight” needs an update. Many animals have at their disposal an additional trick to boost their odds of living through a dangerous encounter. It’s not just fight or flight. It’s fight, flight, or faint. Remarkably, fainting begins the same way as the other two fear responses—with a high-emotion stressor and a surge of adrenaline. But from there fainting follows a different route. Instead of the heart beating faster (tachycardia), it plummets (bradycardia). Instead of blood pressure surging, it plunges. Detecting low-pressure, slow-moving blood, sensors throughout the body signal to the brain that something is terribly wrong: a failing heart or a catastrophic loss of blood. In a protective response, the brain shuts the system down by fainting.

Fainting episodes often begin in the same way and in the same situations as the well-known fight-or-flight response. When animals, including human animals, sense a possibly mortal threat, adrenaline and other hormones (called catecholamines) flood into our bloodstreams. Our hearts race. Our blood pressures soar. We breathe faster. Crucially, we get a burst of energy, allowing us to either escape from the threat or battle it off. But as you’ll soon see, the old duality of “fight or flight” needs an update. Many animals have at their disposal an additional trick to boost their odds of living through a dangerous encounter. It’s not just fight or flight. It’s fight, flight, or faint. Remarkably, fainting begins the same way as the other two fear responses—with a high-emotion stressor and a surge of adrenaline. But from there fainting follows a different route. Instead of the heart beating faster (tachycardia), it plummets (bradycardia). Instead of blood pressure surging, it plunges. Detecting low-pressure, slow-moving blood, sensors throughout the body signal to the brain that something is terribly wrong: a failing heart or a catastrophic loss of blood. In a protective response, the brain shuts the system down by fainting.

Zoobiquity Barbara Natterson-Horowitz

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