**Core Concept**
Glucose transport in muscle cells is a critical process for providing energy to the cells. This process is mediated by specific proteins that facilitate the movement of glucose across the cell membrane.

**Why the Correct Answer is Right**
Glucose transport in muscle cells is primarily facilitated by the glucose transporter type 4 (GLUT4). When insulin binds to its receptor on the muscle cell surface, it triggers a signaling cascade that leads to the translocation of GLUT4 from the intracellular storage sites to the cell surface. Once on the surface, GLUT4 facilitates the uptake of glucose from the bloodstream into the muscle cells. This process is essential for maintaining blood glucose levels and providing energy to the muscle cells.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the type of glucose transporter involved in muscle cells. While glucose transporters are crucial for glucose uptake, the correct answer must identify the specific type involved in muscle cells.

**Option B:** This option is incorrect because it refers to a glucose transporter primarily found in the liver and kidney, not muscle cells. GLUT2 is involved in glucose sensing and transport in these organs, but not in muscle cells.

**Option C:** This option is incorrect because it refers to a glucose transporter primarily found in the brain and small intestine, not muscle cells. GLUT1 is involved in basal glucose transport in these tissues, but not in muscle cells.

**Option D:** This option is incorrect because it does not specify the type of glucose transporter involved in muscle cells. While glucose transporters are crucial for glucose uptake, the correct answer must identify the specific type involved in muscle cells.

**Clinical Pearl / High-Yield Fact**
The insulin signaling pathway that regulates GLUT4 translocation is a critical target for the treatment of type 2 diabetes. Understanding the molecular mechanisms involved in glucose transport in muscle cells is essential for developing effective therapeutic strategies for this condition.

**Correct Answer:** D. GLUT4