The correct explanation of how the nervous system interacts with another organ system is:
"It controls the digestive system by sending signals to the stomach, telling it to contract and digest food."
This response accurately describes how the nervous system influences the digestive system by regulating organ activity through signaling.
The other options contain inaccuracies:
- The interaction with the skeletal system should emphasize movement control rather than sending signals to the legs specifically for speed.
- The muscular system interaction mentioned is incorrect as the nervous system does not send signals to the blood; it sends signals to muscles for movement.
- The interaction with the circulatory system incorrectly states that the nervous system tells the heart to make more blood, whereas the nervous system regulates the heart rate and blood flow but does not directly control blood production.
Thus, the interaction with the digestive system is the most accurate response.