Question

When we are in danger, fear causes the body to release chemicals that increase heart rate and promote alertness.


rewrite

Answer 1

I am not even sure you need the danger part.

Fear triggers the release of chemicals in the body that speed up the heart rate and enhance alertness.

Answer 2

Yes, better.

Answer 3

Fear triggers the release of chemicals in the body that speed up the heart rate and enhance alertness in times of danger.

Answer 4

Fear triggers the release of chemicals in the body that increase heart rate and promote alertness.

Answer 5

Glad you liked it! Let me know if you need any more help.