Final answer:
Non-striated muscles play a vital role in producing involuntary movements by altering the size and shape of surrounding body parts.
Explanation:
The absence of non-striated muscles in our body would lead to the inability to perform involuntary movements as these muscles are responsible for altering the size and shape of surrounding body parts without changing their position, unlike striated muscles. Non-striated muscles, also known as smooth muscles, are found in the walls of organs like the digestive system, blood vessels, and respiratory system.
Learn more about Non-striated muscles in the body here:
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