Respuesta :
First, everything begins with the brain. E-V-E-R-Y-T-H-I-N-G begins with the brain. It sends a signal(NERVOUS SYSTEM) that links to the muscle that lifts the finger(MUSCULAR SYSTEM). Then, the muscle lifts the bone in the finger attached to the muscle(SKELETON). Finally, the task of lifting your finger is finished.
Joints that connect with your finger then your brain controls it like it controls you basically :) ^-^
