Which of the following is not one of the three phases of digestion?

In the context of digestion, the three primary phases are often identified as the cephalic (which involves anticipatory responses), gastric (related to the functioning of the stomach), and intestinal (which pertains to processes occurring in the intestines). The phases focus on the biological and physiological mechanisms that enable the breakdown of food and absorption of nutrients.

The term "cellular" is not recognized as a distinct phase of digestion. Instead, cellular processes are involved in the absorption and utilization of nutrients once they have passed through the digestive system. Therefore, identifying cellular as not being one of the three main phases aligns with the scientific understanding of digestion and its stages.

The other options refer to components or stages that are involved in the broader digestion process, making them relevant to the subject.