1. Mrs. Kelly AP Psychology Old Bridge High School
The Nervous System
Mrs. Kelly
AP Psychology
Old Bridge High School

2. The Nervous System Central Nervous System (CNS)
Includes all neurons in brain and spinal cord
Peripheral Nervous System (PNS)
Neurons (sensory and motor) that run to and from CNS
Connects fingers, toes, etc. to spinal cord

3. The Nervous System
These systems work as connecting and coordinating systems b/w the sense organs, muscles and glands

4. The Nervous System Somatic Nervous System (SNS)
Transmits stimuli from your senses to CNS and from CNS to muscles
Example: feel a hot stove and pull hand away
Autonomic Nervous System (ANS)
(automatic)
Regulates activities of vital organs
Lungs, stomach, intestines, heart liver, eliminative organs, and reproductive organs
We usually cannot voluntarily control these activities
Exceptions: hold breath, control blood pressure, blinking, sneezing

5. The Nervous System 2 divisions of the ANS: Sympathetic Nervous System
Arouses us for defensive action – mobilizes energy
(↑ heartbeat, ↓ digestion, ↑ blood sugar)
“fight or flight” response
Parasympathetic Nervous System
Calms us down – conserves energy
(↓ heartbeat, ↓ blood sugar, etc.)

7. The Nervous System Types of Neurons: Sensory (afferent) neurons
(neuron = nerve cell)
Sensory (afferent) neurons
Takes info up to brain
(sense, intake)
Interneurons
Processes information
(turnstile)
Motor (efferent) neurons
Controls the physical, motor response – muscle skills
(movement, out)
What happened?
Perception?
What should we do about it?