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Nervous System and drug addiction
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Todays Lesson Nervous System and Drug Addiction

Todays Lesson Nervous System and Drug Addiction

Slide 2

Overview of Lesson

Overview of Lesson

Nervous system

Synapses and neurohormones

Drug addiction

Slide 3

Neuron

Neuron

Based on: Raven et al., Biology, McGraw-Hill

Slide 4

Sensory neurons - carry impulses to the

Sensory neurons - carry impulses to the

interneurons of the brain

Interneurons of the brain - interpret impulses

Motor neurons - carry impulses to the muscles

Types of Neurons

Based on: Mader, S., Inquiry Into Life, McGraw-Hill

Slide 5

Nerve Impulse

Nerve Impulse

Stimulation of neuron, opens channels so

that sodium (Na+) goes in, depolarizing the

membrane

The adjacent section of membrane allows

Na+ to go in, depolarizing it

This wave of depolarization continues at a

rapid rate down the neuron, resulting in a

nerve impulse traveling to the brain in

milliseconds

Slide 6

Neuron at Rest: Polarized Membrane

Neuron at Rest: Polarized Membrane

Outside of neuron is positively charged due to positive sodium ions

Inside of neuron is negatively charged due to negative ions

+ + + + + + + + +

- - - - - - - - - - -

Inside of Neuron

Slide 7

+ + + + + + + +

+ + + + + + + +

- - - - - - - - - -

+ + + + + + + +

- - - - - - - - - -

+ + + + +

- - - - - -

0 0 0 0

Neuron

Neuron

Neuron

Polarized membrane of resting neuron

Sodium (Na) moves inside to depolarize

Nerve impulse is wave of depolarization moving down neuron

Nerve

impulse

Nerve Impulse

Slide 8

Depolarization and Repolarization

Depolarization and Repolarization

Based on: Starr, C., Biology: Concepts and Connections, Brooks/Cole

Slide 9

Operates when neuron is at rest or

Operates when neuron is at rest or

not transmitting nerve impulse

Pump is a membrane protein

The protein actively transports Na out

of the axon to re-establish polarity of

membrane

Sodium Pump

Slide 10

Overview of Lesson

Overview of Lesson

Nervous system

Synapses and neurohormones

Drug addiction

Slide 11

There are gaps or junctions between neurons called synapses

There are gaps or junctions between neurons called synapses

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