Is the alimentary canal also called the gastrointestinal tract?

What does the sociological imagination refer to?

Bulimia nervosa is characterized by a. a refusal to eat enough food to maintain normal, healthy body weight and/or the use of measures to produce severe weight loss. b. high fat intake and low level of physical activity. c. alternating binge eating and purging through vomiting, laxatives, or diuretics. d. normal food consumption interrupted by episodes of high consumption, resulting in obesity.

Wha arrow in the figure points to the section that indicates how much food is in the package/container