Final answer:
Intercalated discs aid in electrical impulse transmission in cardiac muscle, while striations in skeletal muscle result from actin and myosin arrangement.
Explanation:
Intercalated discs are specialized regions in cardiac muscle cells that aid in passing electrical impulses, connecting adjacent cells. Striations in skeletal muscle are due to the arrangement of actin and myosin proteins, causing the striped appearance in myofibrils.
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