What is the main function of the gallbladder?

Correct Answer: B

Rationale: The main function of the gallbladder is to store bile produced by the liver and concentrate it. When we eat, the gallbladder releases bile into the small intestine to help with the digestion of fats. Storing bile allows for a controlled release when needed. Choice A is incorrect because bile is produced by the liver, not the gallbladder. Choice C is incorrect as digestive enzymes are mainly produced by the pancreas. Choice D is incorrect as nutrient absorption primarily occurs in the small intestine, not the gallbladder.

Correct Answer: C

Rationale: The correct answer is C (6 liters) because the average daily amount of fluid that passes through the pylorus in a healthy adult is approximately 5-7 liters. This is based on the normal daily volume of gastric juice secretion and other fluids entering the duodenum. Choice A (2 liters) is too low and would not be sufficient for normal bodily functions. Choice B (9 liters) is too high and would lead to excessive fluid loss. Choice D (8 liters) is also too high and would not align with the typical physiological range. Therefore, C is the most accurate option based on the known physiology of the digestive system.

Correct Answer: C

Rationale: The correct answer is C: Meckel's diverticulum. Meckel's diverticulum is a congenital outpouching of the small intestine that may contain gastric or pancreatic tissue, leading to ulceration and bleeding. In this case, the presence of blood in the stools along with abdominal tenderness and anemia is highly suggestive of Meckel's diverticulum. Pyloric stenosis typically presents with non-bloody projectile vomiting in a male infant. Intestinal atresia usually presents with bilious vomiting and abdominal distension in a newborn. Hirschsprung's disease presents with chronic constipation and failure to pass meconium shortly after birth. Therefore, based on the symptoms and age of the child, Meckel's diverticulum is the most likely diagnosis.

Correct Answer: B

Rationale: The correct answer is B: stomach. This morphologic pattern is most commonly seen in scirrhous (fibrous) type of gastric carcinoma. The diffuse intramural spread with extensive fibroblastic thickening is a characteristic feature of scirrhous gastric cancer. This pattern is not typically associated with carcinoma of the esophagus, small intestine, or appendix. The fibroblastic thickening in the stomach is due to desmoplastic reaction caused by the tumor cells, leading to the characteristic linitis plastica appearance on imaging.

Correct Answer: B

Rationale: The correct answer is B: Helps in food absorption. Chewing primarily aids in food breakdown into smaller particles for easier digestion. Chewing does not directly contribute to food absorption, as absorption mainly occurs in the small intestine. A: Sense of satiety is correct, as chewing helps signal fullness to the brain. C: Helps in food digestion is correct, as chewing starts the mechanical breakdown process. D: Increase salivary secretion is incorrect, as chewing stimulates saliva production to aid in digestion.