Which of the following does NOT manufacture digestive juices?

Correct Answer: B

Rationale: The correct answer is B: Kidneys. The kidneys do not manufacture digestive juices. The liver produces bile to aid in digestion, the stomach produces gastric juices, and the pancreas produces digestive enzymes. The kidneys, however, are responsible for filtering blood, regulating fluid balance, and producing urine, not digestive juices. Therefore, option B is the correct answer.

Correct Answer: C

Rationale: The correct answer is C: pepsin. Pepsin is an enzyme produced in the stomach that breaks down proteins into peptides. It functions in an acidic environment, which is characteristic of the stomach. Amylase (A) breaks down carbohydrates, lipase (B) breaks down fats, and trypsin (D) breaks down proteins in the small intestine, not in structure W.

Correct Answer: C

Rationale: Sure. Secretin is the correct answer as it specifically stimulates the release of pancreatic juice. Secretin is released from the duodenum in response to the acidic chyme entering from the stomach. It acts on the pancreas to increase the secretion of bicarbonate-rich pancreatic juice, which helps neutralize the acidic chyme. Insulin (choice A) regulates blood sugar levels, gastrin (choice B) stimulates gastric acid secretion, and glucagon (choice D) increases blood glucose levels. These hormones do not directly stimulate the release of pancreatic juice.

Correct Answer: C

Rationale: Rationale: Insulin facilitates the uptake of glucose from the bloodstream into body cells. When insulin is injected into a healthy person, it enhances glucose absorption by body cells, leading to an increase in glucose concentration within the cells. This process helps regulate blood glucose levels by promoting glucose utilization for energy production and storage. Therefore, choice C is correct. Summary: A: Blood glucose levels would not increase as insulin promotes glucose uptake into cells. B: The liver would not convert glycogen into glucose as a response to insulin injection. D: The cell membrane would not become less permeable to glucose; insulin increases glucose uptake by enhancing membrane transport proteins.

Correct Answer: B

Rationale: The correct answer is B: starch. Salivary glands release amylase to break down starch into maltose in the mouth. Pancreatic amylase continues starch digestion in the small intestine. Fat is broken down by lipase, not secretions from salivary glands or pancreas. Protein is digested by pepsin in the stomach and proteases in the small intestine. Maltose is a product of starch digestion, not the substance digested directly by salivary glands and pancreas.