WOW   Nervous System1/31/06
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WOW Nervous System1/31/06. It senses the bodies surroundings to allow it to interact. It controls all of the other body systems. Why is the nervous system so important?. How is the Nervous system organized.?. The central nervous system. The peripheral nervous system.

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WOW Nervous System1/31/06

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Wow nervous system 1 31 06

WOW Nervous System1/31/06

  • It senses the bodies surroundings to allow it to interact.

  • It controls all of the other body systems.

  • Why is the nervous system so important?


Wow nervous system 1 31 06

  • How is the Nervous system organized.?

  • The central nervous system.

  • The peripheral nervous system.


Wow nervous system 1 31 06

  • How is the Nervous system organized.?

Nervous System

Central Nervous

System

Peripheral Nervous

System

Brain

Spinal

Chord

Somatic

Voluntary from skin

to CNS and skeletal

muscles.

Autonomic

Involuntary from

CNS to Internal

organs

Sympathetic

During Times of

stress

Parasympathetic.

During Times of

rest


Wow nervous system 1 31 06

I. Neurons are nerve cells specialized in sending electrochemical signals.

What do we call nerve cells?


Wow nervous system 1 31 06

What are the three main types of neurons?

1. Sensory Neuron- sense stimulus and carry impulse to the brain

Grab a hot pan

2. Interneuron's found in CNS, process stimulus and pass on to motor neurons.

Thought process. Run, hold tighter, or throw it down.

1. Motor Neurons Carry response from CNS to muscles to stimulate action

Throw it down and yell %3@%$#.


Wow nervous system 1 31 06

How are nerve impulses sent?

  • Uses Ions Na+ and K+

  • Cell membrane has protein channels;

    • Voltage-gated channels

    • Only allow Na+ and K+

    • Closed when neuron at rest

    • Negative charge inside


Wow nervous system 1 31 06

What is action potential?

  • Voltage gates open allow, Na+ to enter.

  • Inside becomes positive causing K+ to

  • leave.

  • This sudden change in voltage causes

  • another Na+ gate to open.

  • One action potential (AP) causes another

  • AP to occur further down axon.

  • Sodium and Potassium pumps use active

    • transport to restore original balance.


Wow nervous system 1 31 06

What speeds up the impulse?

  • A myelin sheath covers axon and allows impulse

    • to pass through axon faster.

    • Impulse jumps from node to node.


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What happens when impulse reaches the end of the axon?

  • Nerves do not touch each other.

  • 2. Nerves separated by Synapses.

  • 3. Nerves send chemical messages through synapses.

  • Neurotransmitters are passed from axon to next neuron.

    • Bind to protein gates in next neuron.

    • Opens ion gates and triggers AP in next neuron.


Wow nervous system 1 31 06

Impulse reaches end of axon

Neuro’s released.

Neurotransmitter released

reabsorbed

Bind to protein receptors

Dissolved into axon


Wow nervous system 1 31 06

1

2


Wow nervous system 1 31 06

What are the main parts of the Nervous System?


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