producing a facial expression
muscular system
Muscular
Muscular
The skeletal system, nervous system, and muscular systems are most directly involved with ambulation.
the muscular system and the skeletal system
Nervous system and Muscular system usually. For some, the Sensory system, a part of the Nervous system, also has to do with reflexes.
epimysium
Muscular, skeletal, nervous and cardiovascular systems directly and endocrine system indirectly.
muscular activity
muscular and skeletal
The Muscular-Skeletal System.
The nervous system.