The _____ part of the stomach is the area that is connected to the esophagus.

Correct Answer: A

Rationale: The correct answer is A: cardiac. The cardiac part of the stomach is the region closest to the esophagus where food enters the stomach. It contains the cardiac sphincter, a muscular valve that regulates the passage of food from the esophagus into the stomach. The other choices, pyloric, fundus, and body, are incorrect because the pyloric region connects the stomach to the small intestine, the fundus is the top portion of the stomach, and the body is the main central region of the stomach where most digestion occurs.

Correct Answer: A

Rationale: The correct answer is A: sinusoids. Sinusoids are specialized blood channels found in the liver that allow for the exchange of nutrients, waste products, and toxins between hepatocytes and blood. They play a crucial role in the liver's functions of detoxification, metabolism, and storage. Central vein (B) is a vessel located in the center of liver lobules, not a blood channel. Hepatic cells (C) refer to the liver cells themselves, not blood channels. Portal veins (D) are vessels that bring blood from the digestive organs to the liver, but they are not the special blood channels within the liver.

Correct Answer: B

Rationale: The correct answer is B: large intestine. The small intestine, plicae circulares, and crypts of Lieberkuhn are all structures found in the small intestine, involved in absorption and digestion. The large intestine is a separate part of the digestive system primarily responsible for water absorption and waste elimination. Therefore, it does not belong with the other choices related to the small intestine.

Correct Answer: B

Rationale: The correct answer is B (stomach) because amylase is an enzyme that breaks down carbohydrates, and it is primarily found in the mouth and the small intestine (duodenum and pancreas). In the mouth, salivary amylase begins the digestion of starches. In the small intestine, pancreatic amylase continues this process. The stomach, however, is not a site for amylase secretion but rather secretes pepsin for protein digestion. Therefore, amylase is not found in the stomach. Choices A, C, and D are incorrect because amylase is indeed present in the mouth, duodenum, and pancreas, respectively.

Correct Answer: B

Rationale: The correct answer is B because pancreatic juice contains enzymes such as Trypsinogen, Lipase, Amylase, and Procarboxypeptidase. Trypsinogen helps in protein digestion, Lipase breaks down fats, Amylase digests carbohydrates, and Procarboxypeptidase aids in protein digestion. Choice A is incorrect because it includes Rennin, which is not typically found in pancreatic juice. Choice C is incorrect because Pepsin is a stomach enzyme, not found in pancreatic juice. Choice D is incorrect because Maltase is an enzyme found in the small intestine, not in pancreatic juice.