The attachment site at the origin is where the muscle attaches; the attachment site at the insertion is where the muscle attaches but moves during contraction.
Muscle and bone are joined together by tendons, which are fibrous connective tissues. Muscles can be joined to tissues like the eyeball through tendon connections as well.
The distinction between voluntary and involuntary muscles is that the former can move under conscious control or at the command of the mind, while the latter move automatically or without conscious command. Smooth muscles and cardiac muscles fall within the category of involuntary muscles.
Skeletal muscles with voluntary action are those that can be consciously controlled to contract and relax. Body movement is controlled by these muscles, which are attached to bones.
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