Gastric motility decreases in A/E-
**Core Concept**
Gastric motility refers to the coordinated muscular contractions of the stomach that facilitate the mixing and movement of food through the gastrointestinal tract. This process is crucial for the proper digestion and absorption of nutrients.
**Why the Correct Answer is Right**
The correct answer is an exception to the statement that gastric motility decreases in certain conditions. Normally, gastric motility is regulated by the enteric nervous system, which includes the myenteric and submucosal plexuses. The myenteric plexus, in particular, is responsible for the rhythmic contractions of the stomach. However, in certain conditions such as pregnancy, gastric motility actually increases due to hormonal changes, particularly the release of gastrin and cholecystokinin.
**Why Each Wrong Option is Incorrect**
* **Option A:** - This option is incorrect because gastric motility typically decreases in conditions such as diabetes mellitus, where neuropathy affects the enteric nervous system.
* **Option B:** - This option is incorrect because gastric motility decreases in conditions such as gastric surgery, particularly after a partial gastrectomy.
* **Option C:** - This option is incorrect because gastric motility decreases in conditions such as vagal nerve damage or atrophy, which impairs the enteric nervous system.
* **Option D:** - This option is incorrect because gastric motility decreases in conditions such as hypothyroidism, where decreased metabolic rate affects gastric function.
**Clinical Pearl / High-Yield Fact**
Gastric motility disorders can be caused by a variety of factors, including neuropathic, hormonal, and mechanical factors. It is essential to identify the underlying cause to provide appropriate treatment.
**Correct Answer:** D. Hypothyroidism.