Ch 11. nervous system

nervous system

controls every thought, action, and emotion. communicates by electrical and chemical signals. has 3 functions including sensory input, integration, and motor output.

sensory input

uses millions of receptors

monitors changes occurring inside and outside of the body

integration

processes and interprets sensory inputs and decides how and when to act

motor output

activates effector organs to cause a response

CNS (central nervous system)

brain (integration center)

spinal cord (transmits info to and from the body)

PNS (peripheral nervous system)

spinal nerves (carry impulses to and from the spinal cord

cranial nerves (carry impulses to and from the brain)

ganglia (collections of neuron cell bodies)

Sensory (afferent) division (PNS)

carries signals from receptors to the CNS

somatic sensory division (PNS) (afferent)

carries signals from receptors in the skin, muscles bones, and joints

visceral sensory division (PNS) (afferent)

carries signals mainly from the viscera of the thoracic and abdominal cavities.