Final answer:
When comparing a HD (Huntington's disease) brain to a normal brain visually, there are noticeable differences in structure and functioning. A normal brain shows greater metabolic activity, while a HD brain exhibits neurodegeneration in specific areas.answer is greater metabolic activity,
Step-by-step explanation:
When comparing a HD (Huntington's disease) brain to a normal brain visually, there are noticeable differences in structure and functioning. In a normal brain, there is a greater level of metabolic activity, indicated by a larger fraction of red and orange areas. On the other hand, a HD brain shows dramatic neurodegeneration, particularly within the ventricles and hippocampus. This can be seen through brain imaging techniques.