What would likely occur if the phrenic nerve is damaged?

If the phrenic nerve is damaged, paralysis of diaphragm function is likely to occur. The phrenic nerve is responsible for innervating the diaphragm, which is the primary muscle involved in respiration. When this nerve is functioning properly, it sends signals to the diaphragm to contract and allow for breathing. If the nerve is compromised, the diaphragm cannot contract effectively, leading to impaired or inadequate ventilation. This can significantly impact respiratory function, as the diaphragm plays a crucial role in the inhalation process by creating negative pressure in the thoracic cavity, thereby drawing air into the lungs. As a result, an individual may experience difficulty breathing and may also rely more heavily on accessory muscles of respiration.

To better understand the situation, consider that options regarding increased lung capacity and enhanced intercostal muscle activity do not directly relate to the direct impact of phrenic nerve damage, as these attributes cannot compensate for the loss of diaphragm function. Additionally, reduced heart rate does not connect with the respiratory functions affected by the phrenic nerve.