Where is bile stored?

Correct Answer: C

Rationale: The correct answer is C: gallbladder. Bile is produced by the liver and stored in the gallbladder. When we eat, the gallbladder releases bile into the small intestine to aid in the digestion of fats. The pancreas produces digestive enzymes, not bile (A). The liver produces bile but does not store it (B). The small intestine is where bile is released, not stored (D). Therefore, the gallbladder is the correct location for bile storage.

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: B

Rationale: The correct answer is B: Control centers in the medulla oblongata. The myenteric plexus is part of the enteric nervous system located in the gastrointestinal tract, involved in regulating gut motility. Sensory neurons (A), motor neurons (C), and synapses (D) are essential components of the myenteric plexus, responsible for sensing stimuli, transmitting signals, and coordinating muscle contractions in the gut. Control centers in the medulla oblongata are part of the central nervous system, not directly related to the myenteric plexus functions. Thus, choice B is incorrect in the context of the components of the myenteric plexus.

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.