Final answer:
The autonomic nervous system, specifically the sympathetic division, is responsible for Kate's increased breathing and heart rate in response to the blood curdling scream coming from her attic.
Step-by-step explanation:
The subject of this question is the Autonomic Nervous System. In this case, Kate's increased breathing and heart rate in response to a blood curdling scream indicates the activation of the sympathetic division of the autonomic nervous system. The sympathetic division prepares the body for an emergency situation by increasing heart rate and other physiological responses to help deal with potential danger.