Answer:
all of the above are true.
Step-by-step explanation:
- The phase of swallowing that occurs involuntarily is termed as swallowing reflex.
- The swallowing reflex occurs after mastication when the bolus has been formed and the food has to be swallowed in.
- This reflex begins when the tongue is raised and presses against the uvula and the soft palate.
- Following this, the epiglottis closes the top of the trachea to avoid the food to enter into the air passage and soft palate, larynx and hyoid bones get raised,
- Finally, the muscles pull the pharynx upward towards the food and the food gets swallowed.