Final answer:
Muscle tissue can be voluntary or involuntary. Voluntary muscle movements are under conscious control, while involuntary muscle movements are not. Muscle tissue is classified into three types: skeletal, cardiac, and smooth.
Step-by-step explanation:
Muscle tissue is characterized by properties that allow movement. Muscle cells are excitable; they respond to a stimulus. They are contractile, meaning they can shorten and generate a pulling force. Some muscle movement is voluntary, which means it is under conscious control. For example, a person decides to open a book and read a chapter on anatomy. Other movements are involuntary, meaning they are not under conscious control, such as the contraction of your pupil in bright light. Muscle tissue is classified into three types according to structure and function: skeletal, cardiac, and smooth.