___ is a muscular valve which controls the passage of food from the stomach into the intestine.

Explanation

**Step-by-Step Solution:**

1. **Identify the Function of the Valve**: The question asks for a muscular valve that controls the passage of food. This valve is crucial for regulating the flow of partially digested food from the stomach to the intestine.

2. **Understand the Structure**: This valve is known as a sphincter, which is a ring of smooth muscle that can contract and relax to open or close the passageway.

3. **Name the Specific Valve**: The specific muscular valve that controls the passage of food from the stomach into the small intestine is called the "pyloric sphincter."

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