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Here are two of the many distinctions to differentiate the three muscle tissues:
1. Shape
Cardiac muscle: branching fibers
Smooth muscle: spindle-shaped
Skeletal muscle: cylindrical
2. Nucleus
Cardiac muscle: one nucleus per cell
Smooth muscle: one nucleus and it is centrally located
Skeletal muscle: multinucleated
Skeletal muscles create movement in the body.
Smooth muscles are involuntary muscles that form the lining of the walls of the blood vessels and viscera.
Cardiac muscles are also involuntary muscles that causes the heart to contract and expand properly.
Source:
What Are the 5 Main Functions of the Muscular System? (2022, March 8). MedicineNet. https://www.medicinenet.com/what_are_the_5_functions_of_the_muscular_system/article.htm