The most acceptable theory for muscle contraction is the sliding filament theory for Huxely, This theory depends on the ultra-microscopic structure of muscle fibers, where each muscle fiber consists of a group of myofibrils...
Nervous system consists central nervous system (Brain and Spinal cord), the peripheral nervous system (Cranial nerves and Spinal nerves), Autonomic nervous system (Sympathetic nervous system and parasympathetic nervous system).
