Embedded Files
In this section (IB Topic 6.5 )
In this section (IB Topic 6.5 )
- Neurons: types and structure
- Neurons: types and structure
- Saltatory conduction (Schwann cells, myelin and nodes of Ranvier)
- Saltatory conduction (Schwann cells, myelin and nodes of Ranvier)
- Resting potential (-70 mV)
- Resting potential (-70 mV)
- Action potential (+30 mV to -80 mV)
- Action potential (+30 mV to -80 mV)
- Threshold potentials (-50 mV)
- Threshold potentials (-50 mV)
- Propagation: local currents
- Propagation: local currents
- Oscilloscope traces
- Oscilloscope traces
- Synapses and neurotransmitters
- Synapses and neurotransmitters
- Acetylcholine
- Acetylcholine
6.5 Vocabulary
6.5 Vocabulary
6.5Vocabulary.pdf6.5_Kerboodle_Worksheet.pdfAnswers here.
Neurons transmit electrical impulses from the dendrites to the axon terminal. In order to do so, the neuron membrane maintains a resting potential of approximately -70 mV. When the neuron is stimulated (by a receptor or by another neuron) an electrical impulse may be generated. A series of local depolarizations and depolarizations of the plasma membrane take place as the impulse moves along the membrane.
Saltatory conduction
Saltatory conduction
saltatory-conduction.mp4
Why is myelin so important?
Why is myelin so important?
NerveSystemSynapsePPT.pptoscilloscope-trace.mp4Nervous System.ppt6.5_nerveshormoneshomeostasis.pptx
Bioethics
Bioethics
How can we better understand the functioning of the human brain?
Revision stuff
Revision stuff
Focus more on these understandings, applications and skills:
Focus more on these understandings, applications and skills:
- Neurons transmit electrical impulses
- Neurons pump sodium and potassium ions across their membranes to generate a resting potential
- An action potential consists of depolarization and repolarization of the neuron
- Nerve impulses are action potentials propagated along the axons of neurons
- Propagation of nerve impulses is the result of local currents that cause each successive part of the axon to reach the threshold potential
- Synapses are junctions between neurons and between neurons and receptor or effector cells
- When presynaptic neurons are depolarized they release a neurotransmitter into the synapse
- A nerve impulse is only initiated if the threshold potential is reached
- Secretion and reabsorption of acetylcholine by neurons at synapses
- Blocking of synaptic transmission at cholinergic synapses in insects by binding of neonicotinoid pesticides to acetylcholine receptors
Questions related to these are:
Questions related to these are:
- Explain how nerve impulse passes along the neuron.
- Explain the synapse transmission.
- Describe how pesticide neonicotinoid kills insects.
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