Introduction:
The statement "All muscles produce movement but only skeletal muscle is responsible for locomotion" highlights the distinction between different types of muscles and their respective functions. While all muscles have the ability to generate movement, it is the skeletal muscles that specifically enable locomotion in the body.

Types of Muscles:
1. Skeletal Muscles: These are the muscles responsible for voluntary movements and are attached to the skeleton. They are striated in appearance and are under conscious control. Skeletal muscles work in pairs, with one muscle contracting while the other relaxes to produce movement.
2. Smooth Muscles: These muscles are found in the walls of internal organs such as the digestive tract, blood vessels, and respiratory system. They are non-striated and are involuntarily controlled by the autonomic nervous system. Smooth muscles play a crucial role in various bodily functions such as peristalsis, constriction of blood vessels, and airflow regulation.
3. Cardiac Muscles: These muscles are exclusively found in the heart and are responsible for its rhythmic contractions. Cardiac muscles are striated and are involuntarily controlled. They possess specialized properties that allow them to contract continuously and efficiently pump blood throughout the body.

Explanation:
While all muscle types are involved in producing movement, only skeletal muscles are responsible for locomotion. Locomotion refers to the ability to move from one place to another, which is primarily achieved through the contraction and relaxation of skeletal muscles.

Skeletal muscles are attached to the bones via tendons, and when they contract, they pull on the bones, causing movement at the joints. This coordinated action of skeletal muscles enables the body to perform various activities such as walking, running, jumping, and lifting objects. The contraction of specific muscle groups in a sequence allows for coordinated and efficient movement.

On the other hand, smooth muscles and cardiac muscles do not contribute directly to locomotion. Smooth muscles regulate the movement of substances within the body, such as food through the digestive tract or blood through blood vessels. Cardiac muscles, as mentioned earlier, are responsible for the continuous pumping of blood to supply oxygen and nutrients to the body's tissues.

Conclusion:
In summary, while all muscles can produce movement, it is only skeletal muscles that are responsible for locomotion. Skeletal muscles, with their voluntary control and attachment to the skeleton, play a crucial role in enabling the body to move and perform various activities. Understanding the distinctions between different muscle types helps in appreciating their specific functions and contributions to overall bodily movements.