Which part of the peripheral nervous system would be particularly important to a backpacker chase by bear?

The Sympathetic Nervous System

When a backpacker is being chased by a bear, the sympathetic nervous system is particularly important. This part of the peripheral nervous system is responsible for the body's "fight or flight" response, which is a series of physiological changes that prepare the body for physical activity.

The sympathetic nervous system activates the release of hormones such as adrenaline and noradrenaline, which cause the heart rate and breathing to increase, the muscles to tense up, and the blood sugar levels to rise. These changes give the body the energy and strength it needs to either fight the bear or escape.

In addition, the sympathetic nervous system also helps to direct blood flow away from non-essential organs and tissues and towards the muscles and brain, which are needed for survival. This ensures that the body has the resources it needs to fight or flee.