How does the nervous system influence the respiratory system?(1 point)
It regulates blood pressure.
It regulates urine output.
It controls muscle contraction.
It stimulates defense against pathogens.
It controls muscle contraction.
The nervous system controls muscle contraction.
The correct answer is: It controls muscle contraction.
The nervous system influences the respiratory system by controlling the muscles responsible for breathing. The main nerve involved in this process is the phrenic nerve, which controls the diaphragm muscle. When the nervous system sends signals through the phrenic nerve, the diaphragm contracts and moves downward, allowing the lungs to expand and fill with air. This contraction and relaxation of respiratory muscles help in inhaling and exhaling air, which is crucial for the exchange of oxygen and carbon dioxide in the body. Thus, the nervous system plays a vital role in regulating and coordinating the muscle contractions necessary for proper breathing.