The soft palate reflexively opens the nasopharynx to allow the passage of food is called

The soft palate reflexively opens the nasopharynx to allow the passage of food is called bolus is not true. During the pharyngeal stage, the soft palate elevates and contacts the lateral and posterior walls of the pharynx, closing the nasopharynx at about the same time that the bolus head comes into the pharynx. Soft palate elevation prevents bolus regurgitation into the nasal cavity

Explanation:

When food is ingested into the mouth, the tongue carries the food to the post-canine region and rotates laterally, placing the food onto the occlusal surface of lower teeth for food processing. During food processing, food particles are reduced in size by mastication and softened by salivation until the food consistency is optimal for swallowing. during food processing, the tongue and soft palate both move cyclically in association with jaw movement, permitting open communication between the oral cavity and pharynx. When a portion of the food is suitable for swallowing, it is placed on the tongue surface and propelled back through the fauces to the oropharynx ... The area of tongue-palate contact gradually expands backward, squeezing the triturated food back along the palate to the oropharynx. Pharyngeal swallow is a rapid sequential activity, occurring within a second. During the pharyngeal stage, the soft palate elevates and contacts the lateral and posterior walls of the pharynx, closing the nasopharynx at about the same time that the bolus head comes into the pharynx. Soft palate elevation prevents bolus regurgitation into the nasal cavity.