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

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Nervous System

Nervous System - Functions - Collects information about the body ’ s internal and external environment - Regulates organs - Regulates behavior - 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 ·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 ·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 Dependent upon electrical activity Electrical charges of the neuron and its surroundings differ This creates a “potential” RESTING POTENTIAL Not receiving or transmitting a signal ACTION POTENTIAL Receiving or transmitting a signal

---electric message---- chemical message

Checking: 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 ___________, ______________ or _____________. 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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