Final answer:
The abnormalities associated with myoclonic epilepsy and ragged-red fiber disease are found in the muscles (c). These conditions involve the mitochondria within muscle cells, producing characteristic muscle issues, despite myoclonic epilepsy involving electrical activity in the brain.
Step-by-step explanation:
Myoclonic epilepsy and ragged-red fiber disease are both disorders that affect the body on a cellular level, specifically in the mitochondria of cells. The correct answer to the question is c) Muscles. These conditions are associated with abnormalities in the muscles rather than the heart, brain, or liver.
Myoclonic epilepsy is a condition that can cause spontaneous, twitches due to abnormal electrical activity in the brain. However, the term 'myoclonic' refers to the muscle contractions themselves, and its association with myoclonic epilepsy does not mean that the origin of the disorder is in the muscles. Ragged-red fibers are a characteristic finding in muscle biopsies of patients with mitochondrial disorders; these fibers are named for their appearance under the microscope. Mitochondrial diseases like this often result in muscle weakness and can affect many systems in the body due to the role of mitochondria in generating energy for cells.
Hence, the answer is option c.