1. The Nervous System Mr. Koch AP Psychology Forest Lake 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: (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?