**Core Concept**
Electrical synapses are specialized intercellular connections that allow for direct transmission of electrical signals between adjacent cells. This type of communication is crucial for coordinated action in various tissues, including the nervous system, heart, and smooth muscle.

**Why the Correct Answer is Right**
Electrical synapses are closely associated with gap junctions, which are channels formed by connexin proteins that connect the cytoplasm of adjacent cells. These channels allow for the direct exchange of ions and small molecules, enabling the rapid transmission of electrical signals. Gap junctions are essential for the coordinated contraction of smooth muscle in the gastrointestinal tract and the synchronized contraction of cardiac muscle cells.

**Why Each Wrong Option is Incorrect**
**Option A:** Neuromuscular junctions are chemical synapses that transmit signals from motor neurons to skeletal muscle fibers through the release of neurotransmitters. They are not involved in electrical synapses.
**Option B:** Tight junctions are another type of intercellular connection that forms a seal between adjacent cells, preventing the free diffusion of ions and small molecules. They are not associated with electrical synapses.

**Clinical Pearl / High-Yield Fact**
Gap junctions are essential for the synchronized contraction of cardiac muscle cells, which is critical for maintaining a regular heartbeat. Dysfunction of gap junctions has been implicated in various cardiac arrhythmias and conduction disorders.

**✓ Correct Answer: C. Gap junction**