The mass movement of the colon would be abolished by
**Core Concept**
The mass movement of the colon refers to the rhythmic contractions of the intestinal smooth muscle that propel contents through the colon. This process is vital for the proper mixing and elimination of feces. The main factor regulating this movement is the enteric nervous system, which responds to various stimuli, including food, hormones, and neurotransmitters.
**Why the Correct Answer is Right**
The correct answer is related to the role of the enteric nervous system in regulating the mass movement of the colon. The enteric nervous system releases neurotransmitters, such as acetylcholine and serotonin, which stimulate the intestinal smooth muscle to contract. These contractions are essential for the proper movement of feces through the colon. Inhibiting the enteric nervous system's activity would abolish the mass movement of the colon.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not directly affect the enteric nervous system's activity, which is responsible for the mass movement of the colon.
**Option B:** This option is incorrect because it refers to the regulation of the gastrointestinal tract's motility, which is a broader concept that encompasses more than just the mass movement of the colon.
**Option C:** This option is incorrect because it is a type of antispasmodic agent that can relax smooth muscle, but it does not specifically target the enteric nervous system or abolish the mass movement of the colon.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the enteric nervous system functions autonomously, with its own intrinsic reflexes that do not require input from the central nervous system. This intrinsic function is essential for maintaining the normal motility of the gastrointestinal tract.
**Correct Answer:** C.