Responsible for the reception & processing of sensory information from both external & internal environments

Nerves that carry sensory messages to the CNS & motor commands from the CNS to muscles & glands.

Brain & Spinal cord
Including all types of neurons such as dendrites, axons, sensory, interneuron, and motor.

Control movement via skin, skeletal muscles & tendons.

Controls smooth muscle, cardiac muscle & glands.
Also has reflex action that regulate blood pressure, breathing rate, etc.
Sensory neurons in contact with internal organs send messages to the CNS, complete reflex by motor neurons acting within the autonomic system.

Operates through a series of interconnected neurons. Associated with the fight or flight response when faced with danger.

Digest System that keeps energy and slows down heart rate which increases activity in the glands and intestines.