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Adrenaline is known as a 'fight or flight' response, but most people who scream tend to do neither.
I think it is all of these. When people are extremely scared they quite often go into a shock stage which stops them from moving, hence the corruption of the word petrified which means turned to stone. If you are unable to fight or flight you have an excess of adrenaline which is then released as a scream. Knowing that you are a goner enables you to warn others so that they CAN run. I think the whole response to fear is a primitive thing.
No, I don't see adrenaline as having a role. Adrenaline is known as a 'fight or flight' response, but most people who scream tend to do neither.As you say, it is probably an alarm call, either demanding assistance, or causing the flight of others.
Another thing to think about - who is it who usually screams? It is usually women and children (yes, I know it is stereotyping, so bear in mind the word 'usually', rather than assume I mean it indiscriminately).Women and children were traditionally on their home range, and any danger that threatened them was probably also threatening their kith and kin. If they shouted in response to danger, it would either bring the rest of their tribe to their assistance, or at least give their kith and kin time to flee.Compare that with a male who might be on a hunting trip, or at war with a neighbouring tribe. If he screams in response to danger, he would be giving the game away, and the people coming to see what all the noise was about would likely not be friendly to him.