Answer :
The correct answer to the question is:
Sympathetic division of the PNS.
Here's an explanation to support this answer:
1. The sympathetic division of the peripheral nervous system (PNS) is responsible for the body's fight-or-flight response.
2. When a person is startled, the sympathetic division is activated, leading to physiological changes in the body to prepare it for action.
3. Activation of the sympathetic division results in an increase in heart rate to pump more blood to the muscles, an increase in breathing rate to enhance oxygen intake, and a slowing of digestion as resources are diverted to more immediate needs.
4. These changes help the body respond quickly to perceived threats or stressful situations by mobilizing energy and increasing alertness.
In summary, when a person is startled and experiences an increase in heart rate, breathing rate, and a slowing of digestion, it is the sympathetic division of the peripheral nervous system that is responsible for these physiological responses.
