**Core Concept**
Fibroblasts play a crucial role in wound healing by producing extracellular matrix components, such as collagen, and regulating the healing process. During this process, fibroblasts undergo significant changes to facilitate the production and deposition of these matrix components.

**Why the Correct Answer is Right**
Fibroblasts in healing wounds contain large quantities of rough endoplasmic reticulum (RER). The RER is responsible for the synthesis and folding of proteins, including collagen, which is a key component of the extracellular matrix. The increased RER in fibroblasts allows for the efficient production of collagen and other matrix components, facilitating wound healing.

**Why Each Wrong Option is Incorrect**
* **Option A:** Cytoplasm - While fibroblasts do contain cytoplasm, it is not the specific cell part that is known for containing large quantities in healing wounds.
* **Option B:** Mitochondria - Mitochondria are the site of cellular respiration and energy production, but they are not specifically associated with the production of extracellular matrix components in fibroblasts.
* **Option D:** Lysosomes - Lysosomes are involved in cellular digestion and degradation, but they are not directly involved in the synthesis and production of extracellular matrix components in fibroblasts.

**Clinical Pearl / High-Yield Fact**
Fibroblasts are responsible for producing approximately 80% of the collagen in the extracellular matrix, making them a crucial component of the wound healing process.

**Correct Answer: C. Rough Endoplasmic Reticulum.**