Nervous System: WOOOOHOOOO. Nervous System - Functions - Collects information about the body’s internal and external environment - Regulates organs -

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Nervous System: WOOOOHOOOO

Nervous System - Functions - Collects information about the body’s internal and external environment - Regulates organs - Regulates behavior, emotion, personality - Controls sensory and motor functions - Maintains homeostasis

Major Components Central Nervous System (CNS) ◦ Brain and spinal cord Peripheral Nervous System (PNS) ◦ Sensory neurons ◦ Motor neurons

Main Parts: CNS (Central Nervous System) Brain ◦ Control center ◦ Processes and relays information Spinal Cord ◦ Main communication link between brain and rest of the body

Coordination of Movement Decision Making

Main Parts-PNS Sensory Neurons ◦ Transmit information about environment to the brain Motor Neurons ◦ Transmit impulse from the brain to muscles

Basic Unit = Neuron ◦ Dendrites  Receive electrical signal ◦ Cell Body  Signal is then sent to this central region ◦ Axon  The signal is carried through this to the synapse ◦ Synapse  Junction between the axon of one neuron and the dendrites of another

axon cell body dendrites synapse NEURON

How the CNS and PNS work together: PNS CNS

Neuron Function To transmit signals from one neuron to another Depends on electrical activity Difference in charges of the neuron & surrounding  creates a potential RESTING POTENTIAL Not receiving or transmitting a signal ACTION POTENTIAL Receiving or transmitting a signal

---electric message---- chemical message

synapse The Synapse: A Chemical PARTY

Trivia! 1.What two organs make up the central nervous system? a. ________________ b.______________ 2.What is the difference between sensory neurons and motor neurons? a.Sensory neurons bring impulses to the ________. b. __________ neurons bring impulses to ___________. 3. A neuron at ________________ potential is not sending a signal. 4.What is the nature of the signal transmitted in the space BETWEEN two neurons? A.ElectricalB. ChemicalC. Refractory

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