Final answer:
Voluntary muscles, such as skeletal muscles, are under conscious control, whereas involuntary muscles, including cardiac and smooth muscles, operate without conscious control. The statement that volunteers are striated and involuntarily smooth, not controlled by will, is correct.
Step-by-step explanation:
The difference between voluntary and involuntary muscles pertains to whether they are under conscious control or not. Voluntary muscles, such as skeletal muscles, can be controlled by an individual's will, implying that actions such as walking, picking up objects, or any movement of the limbs are regulated by these muscles. On the other hand, involuntary muscles operate without conscious control and are found in areas like the heart (cardiac muscles) and in the walls of other organs such as the intestines (smooth muscles).
It's important to note that the correct answer regarding the types of muscles is that voluntary muscles are striated and under conscious control, while involuntary muscles are mostly smooth and not under conscious control. Therefore, the statement that voluntary muscles cannot be consciously controlled, as with cardiac muscles, is incorrect. Also incorrect is the statement that involuntary muscles can be controlled by an individual's will, such as skeletal muscles.