The Nervous System Chapter 7. Action Potential (nerve impulse)

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Presentation transcript:

The Nervous System Chapter 7

Action Potential (nerve impulse)

Action Potential AT REST: Inside neuron  Negative Outside neuron  Positive

Sodium Potassium pump

Action Potential Stimulus disturbs plasma membrane Na + channels open, starting an action potential

Membrane is Depolarized Local region inside cell now has net positive charge and outside cell a net negative charge (This is opposite of when at rest!)

Repolarization Changes occur behind moving action potential to restore the resting membrane potential

Sodium-Potassium pump fully restores the resting membrane potential Uses ATP to restore the proper concentrations of Sodium and Potassium ions inside and outside the cell

Light Camera Action – Bean Activity

Sodium (Na) ions + Potassium (K) ions +

Multipolar Neurons

bipolar Neurons

unipolar Neurons

Regions of the Brain Cerebral hemispheres (cerebrum) Diencephalon Brain stem Cerebellum

Regions of the Brain

Cerebral hemispheres (cerebrum)

Surface Lobes of cerebrum Frontal lobe Parietal lobe Occipital lobe Temporal lobe

Frontal Lobe

Frontal Lobe (left)

Frontal Lobe (Right)

Parietal lobe

Occipital lobe

Temporal lobe (left)

Temporal lobe (right)

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