Which of the following contributes to the digestion of lipids?

Correct Answer: C

Rationale: The correct answer is C: gall bladder. The gall bladder stores and releases bile produced by the liver, which aids in the digestion of lipids by emulsifying fats. This process breaks down large fat globules into smaller droplets, increasing the surface area for enzymes to act upon. Salivary glands (choice A) produce saliva that contains enzymes for carbohydrate digestion. The stomach (choice B) primarily digests proteins through the action of gastric enzymes. The large intestine (choice D) mainly absorbs water and electrolytes, not involved in lipid digestion.

Correct Answer: C

Rationale: The correct answer is C: stomach. After food leaves the esophagus, it enters the stomach for further digestion. The stomach secretes digestive enzymes and acids to break down food. The liver (choice A) is not where food enters after the esophagus. The pharynx (choice B) is part of the throat and not a digestive organ. The pancreas (choice D) is involved in producing digestive enzymes but food does not enter it directly after the esophagus.

Correct Answer: D

Rationale: The correct answer is D: the heart. The heart is not an organ of the digestive system. The digestive system is responsible for breaking down food and absorbing nutrients. The stomach, mouth, and intestines are all essential organs involved in this process. The heart, on the other hand, is part of the circulatory system, responsible for pumping blood throughout the body. It plays no direct role in digestion. Therefore, D is the correct answer.

Correct Answer: C

Rationale: The correct answer is C: converting glycogen into glucose. When no carbohydrate ingestion occurs, the liver breaks down stored glycogen into glucose through a process called glycogenolysis to maintain blood glucose levels. This process provides a source of energy for the body. Emulsification (A) is the breakdown of fats into smaller droplets, not related to carbohydrate breakdown. Manufacturing more bile (B) is not directly related to liver activity in response to no carbohydrate ingestion. Releasing iron (D) is unrelated to the liver's response to carbohydrate deprivation.

Correct Answer: B

Rationale: The correct answer is B: fresh fruits and vegetables. Roughage, also known as dietary fiber, is essential for digestive health. Fruits and vegetables are rich in fiber, promoting healthy digestion, preventing constipation, and reducing the risk of chronic diseases. Red meat and poultry (choice A) are good sources of protein but lack fiber. Eggs and milk products (choice C) are also protein-rich but low in fiber. Animal fat and plant oil (choice D) are high in fats but do not provide fiber. Therefore, fresh fruits and vegetables are the best choice for including roughage in a balanced diet.