The muscular system isn't made up of individual organisms, but rather different types of tissues that work together to create movement and support the body. Here's a breakdown:

* Muscle tissue: This is the primary component of the muscular system. There are three main types:

* Skeletal muscle: Attached to bones, responsible for voluntary movements.

* Smooth muscle: Found in internal organs like the digestive tract and blood vessels, responsible for involuntary movements.

* Cardiac muscle: Found only in the heart, responsible for pumping blood.

* Connective tissue: This includes tendons (connect muscle to bone), ligaments (connect bone to bone), and fascia (surrounds and supports muscles).

* Nerves: These carry signals from the brain and spinal cord to muscles, allowing for voluntary and involuntary control.

So, it's not about individual organisms, but about these different tissues working together to form the complex and dynamic muscular system.