During the pharyngeal phase of swallowing, respiration is inhibited. This is due to the fact that when the soft palate is elevated, the opening from the nasopharynx to the oropharynx is blocked, preventing air from entering the lungs. This is necessary to prevent food from entering the respiratory tract during swallowing.

How is respiration inhibited during swallowing?

During swallowing, respiration is inhibited by a reflex known as the ‘swallowing reflex.’ When the swallowing reflex is triggered, it causes the muscles of the diaphragm and chest wall to relax, causing a decrease in respiration rate. This decrease in respiration rate allows for the passage of food and liquid down the esophagus and into the stomach without interfering with the respiration process.

What is Stage 3 of swallowing?

Stage 3 of swallowing is the final stage in the swallowing process. During this stage, the muscles of the throat and tongue contract to forcefully push the food or liquid through the esophagus and into the stomach. It is the most intense part of the swallowing process and can take up to 15 seconds to complete. The muscles of the throat and tongue must work together in a coordinated effort to ensure that the food is pushed all the way down to the stomach. During this stage, the soft palate is also closed to prevent food or liquid from entering the nasal cavity.