“Everything psychological is simultaneously biological.”

Neurons Neurons communicate within our body to control all of our sensations, action, behaviors For a neuron to “turn on” it must reach THRESHOLD Threshold: a minimum amount of neurotransmitters must “ignite” the dendrite

Neurons detects

Neurons detects Cell body

Neurons Cell body

Neurons Cell body

Neurons Cell body

Neurons Cell body

Neurons

 Synapse Synapse  Space in between sending neuron & receiving neuron  Neurotransmitters Neurotransmitters  chemical messengers that cross the synaptic gaps between neurons.  Reuptake Reuptake  The terminal button recycles left over NT How Neurons Communicate

How Neurons Communicate Reuptake

 Acetylcholine (AcH)  Dopamine  Serotonin  Norepinephrine  Endorphins Endorphins How Neurotransmitters Influence Us muscle & memory Alzheimer’s pleasure, too much = schizophrenia too little = Parkinson’s mood (happy), hunger, sleep too little = depression SSRI

#3. Explain how a neuron sends a message:

Objective 4: What are the functions of the nervous system’s main divisions? electrochemical communication network

The Nervous System

can be consciously overridden

The Nervous System

fight or flight opponent process homeostasis rest & digest

digestion slows