Final answer:
Mitochondria contribute to HD symptoms by affecting energy production in cells, resulting in a range of symptoms such as fatigue, blurry vision, muscle spasms, and vomiting.
Step-by-step explanation:
The mitochondria contribute to the symptoms of HD by impacting the energy production in cells. Mitochondrial diseases can cause problems in muscle cells and cells of the nervous system, which can result in symptoms such as fatigue, blurry vision, muscle spasms, and vomiting. The wide range of symptoms in mitochondrial diseases is due to the varying levels of mitochondrial damage in different cells of the body.