Which of the following is synthesized and stored in the liver cells?

Correct Answer: C

Rationale: The correct answer is C: Glycogen. Glycogen is synthesized and stored in liver cells as a form of glucose storage for energy. The liver plays a key role in regulating blood glucose levels by converting excess glucose into glycogen for storage. Galactose (A) is a sugar found in milk and is metabolized in the liver, but it is not synthesized or stored there. Lactose (B) is a disaccharide found in dairy products and is broken down into glucose and galactose in the intestine, not synthesized or stored in the liver. Arabinose (D) is a sugar found in plants but is not synthesized or stored in the liver.

Correct Answer: A

Rationale: The correct answer is A because aspirating for gastric secretions ensures proper tube placement in the stomach, reducing the risk of aspiration pneumonia. Choice B is irrelevant and doesn't address the immediate post-insertion step. Choice C is incorrect as starting feeding immediately can lead to complications if the tube is not in the correct position. Choice D is incorrect as X-ray verification is not needed immediately after insertion.

Correct Answer: C

Rationale: The correct answer is C: decreases peristalsis by inhibition of smooth muscle. The sympathetic nervous system inhibits gastrointestinal motility by decreasing peristalsis. This is achieved through the release of norepinephrine, which binds to adrenergic receptors on smooth muscle cells, leading to reduced contraction and motility. Choices A and B are incorrect because the sympathetic nervous system can still affect smooth muscle, not just skeletal muscle. Choice D is incorrect because sympathetic stimulation does not directly increase peristalsis.

Correct Answer: B

Rationale: The correct answer is B: falciform ligament. The falciform ligament attaches the liver to the anterior abdominal wall and separates the right and left lobes of the liver. It is a broad, thin ligament that resembles a sickle. The other choices are incorrect because: A: The coronary ligament attaches the liver to the diaphragm, not the abdominal wall. C: The quadrate ligament attaches the liver to the gallbladder and the lesser curvature of the stomach. D: The caudate ligament attaches the liver to the diaphragm and is not directly related to the abdominal wall attachment.

Correct Answer: D

Rationale: The correct answer is D. Salivary secretion is stimulated by the salivary nucleus in the brainstem and local reflexes in the tunica mucosa and submucosa of the oral cavity. The salivary nucleus receives input from higher brain centers and initiates the salivary reflex. Local reflexes in the oral cavity, such as mechanical stimulation of the mucosa, also trigger salivary secretion. Gastrin, as mentioned in option B and C, is not directly involved in the stimulation of salivary secretion. Option A is incorrect as salivary secretion is not solely stimulated by the salivary nucleus. Option D encompasses the comprehensive stimulation pathways involved in salivary secretion.