Reflux of gastric juice due to diminished the lower esophageal sphincter tone with symptoms as heart burn or atypical chest pain.

Correct Answer: C

Rationale: GERD is caused by a weakened lower esophageal sphincter, allowing gastric juice to reflux, causing heartburn.

Correct Answer: C

Rationale: Enteroendocrine cells release hormones into the bloodstream (endocrine function), not just the GIT lumen.

Correct Answer: C

Rationale: The submandibular gland has prominent striated ducts, like other major salivary glands.

Correct Answer: C

Rationale: Chief cells in the stomach are responsible for secreting pepsinogen, which is then activated to pepsin by the acidic environment created by HCl.

Correct Answer: D

Rationale: Humans have 12 monophyodont teeth (premolars and molars), which erupt only once, unlike diphyodont teeth (incisors, canines) that replace milk teeth.