Grey's Anatomy Quotes: Deterioration of the Fight or Flight Response/Losing My Religion

Meredith: Human beings need a lot of things to feel alive.
George: Family...
Cristina: Love...
Izzie: Sex.
Derek: But we only need one thing...
Burke: To actually be alive.
Cristina: We need a beating heart.
Addison: When our heart is threatened...
Alex: we respond in one of two ways.
George: We either run...
Derek: Or...
Izzie: we attack.
Chief: There's a scientific term for this:
Alex: Fight...
Addison: or flight.
Bailey: It's instinct...
Meredith: We can't control it.
Izzie: Or can we?