The Nervous System. Overview of the Nervous System Overview of the Nervous System.
THE NERVOUS SYSTEM
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Transcript of THE NERVOUS SYSTEM
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THE NERVOUS SYSTEMHow do neurons communicate?
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THE ROAD TO CEPHALIZATION…
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TRY THIS!
1. Which letter represents the dendrite of the sensory neuron?
2. What type of cell is found only in the central nervous system?
3. What structure conducts nerve impulses from the spinal cord to the gall bladder?
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TRY THIS!
1. Which letter represents the dendrite of the sensory neuron?W
2. What type of cell is found only in the central nervous system? Interneuron
3. What structure conducts nerve impulses from the spinal cord to the gall bladder? Motor Neuron
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TRY THIS!
What event occurs during repolarization? A. the sodium gates openB. the potassium gates openC. the net movement of sodium ions into the
axonD. the net movement of potassium ions into
the axon
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TRY THIS!
What event occurs during repolarization? A. the sodium gates openB. the potassium gates openC. the net movement of sodium ions into the
axonD. the net movement of potassium ions into
the axon
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TRY THIS!
Which of the following occurs between time X and time Y?
A. repolarizationB. depolarizationC. resting potentialD. refractory period
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TRY THIS!
Which of the following occurs between time X and time Y?
A. repolarizationB. depolarizationC. resting potentialD. refractory period
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TRY THIS!
What event occurs during depolarization?
A. the sodium gates closeB. the potassium gates openC. the net movement of sodium ions into the axonD. the net movement of potassium ions into the axon
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TRY THIS!
What event occurs during depolarization?
A. the sodium gates closeB. the potassium gates openC. the net movement of sodium ions into the
axonD. the net movement of potassium ions into the axon
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TRY THIS!
Tell the story of how information travels from your spinal cord to the muscles of your arm to make them move. Include the following terms: Resting potential Action potential
Depolarization Repolarization
Refractory Period Propagation
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TRY THIS! Compare resting potential and action
potential
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TRY THIS! Compare resting potential and action
potential
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PROPAGATION OF THE NERVE IMPULSE
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Where in the myelinated axon would an action potential actually occur?
TRY THIS!
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Where in the myelinated axon would an action potential actually occur?
TRY THIS!
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TRY THIS!
How does a neuron respond to a strong stimulus?A. It produces a larger action potentialB. It causes more ions to move across the
neuron membraneC. It causes more action potentials in a
given period of timeD. It causes action potentials to be
conducted at a faster speed
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TRY THIS!
How does a neuron respond to a strong stimulus?A. It produces a larger action potentialB. It causes more ions to move across the
neuron membraneC. It causes more action potentials in a
given period of timeD. It causes action potentials to be
conducted at a faster speed
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TRANSMISSION ACROSS THE SYNAPSE
Animation
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TRANSMISSION ACROSS THE SYNAPSE
Nerve impulse reaches the axon bulb
Ca2+ ions move into the axon bulb.
Ca2+ ions interact with contractile proteins and pull the vesicles containing neurotransmitters to the surface of the presynaptic membrane.
The vesicles merge with the presynaptic membrane and release neurotransmitters into the synaptic cleft by exocytosis.
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TRANSMISSION ACROSS THE SYNAPSE
The neurotransmitters diffuse across the cleft.
The neurotransmitters bind with specific receptors on the postsynaptic membrane.
Depolarization occurs on the postsynaptic membrane if threshold is reached.
The neurotransmitter is destroyed by an enzyme (ex. acetylcholinesterase) or reabsorbed back into the presynaptic membrane.
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TRY THIS!
Which of the following describes the role of calcium ions during synaptic transmission?
A. They cause Y to become inactivated.B. They act as carriers to move Y toward Z.C. They cause Y to undergo endocytosis at W.D. They initiate the process that results in X moving toward W.
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TRY THIS!
Which of the following describes the role of calcium ions during synaptic transmission?
A. They cause Y to become inactivated.B. They act as carriers to move Y toward Z.C. They cause Y to undergo endocytosis at W.D. They initiate the process that results in X moving toward W.
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TRY THIS!
Tell the story of how information travels from your spinal cord to the muscles of your arm to make them move. Include the following processes: Resting potential Action potential
Depolarization Repolarization
Refractory Period Propagation Transmission
across the Synapse