How do the structures and the functions of the nervous system work together to help prevent injuries?

Through automatic reactions to harmful stimuli

Explanation:

One way is that the nervous system allows your body to automatically react to avoid dangers without the nerves needing to send a signal to the brain. One example is that your hand will automatically pull away when touching something hot, you don't have to think about it and tell your hand to pull away. This saves time and prevents injury.

the answer would be 3