Final answer:
Skeletal muscles are responsible for movement and posture, while smooth muscles function in involuntary movements.
Step-by-step explanation:
Skeletal muscles are responsible for movement of the skeleton and maintaining posture. They are voluntary muscles, meaning they can be consciously controlled.
Smooth muscles function in various involuntary movements, such as those involved in digestion and blood flow. They can be found in the walls of organs and blood vessels.