Electrical activity in the NS
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Questions and Answers

What is the resting membrane potential?

-70mV

What is the law by which action potentials arise?

All or none law

Phases of an action potential?

Threshold phase, depolarising phase, re-polarising phase, refractory period

What is an absolute refractory period?

<p>Neuron will not respond to additional stimulation</p> Signup and view all the answers

What is a relative refractory period?

<p>Neuron will respond to additional stimulation - if it is strong enough</p> Signup and view all the answers

What is facilitation in the context of synapse transmission?

<p>Excitatory post synaptic potential (EPSP)</p> Signup and view all the answers

What is inhibition in the context of synapse transmission?

<p>Inhibitory post synaptic potential (IPSP)</p> Signup and view all the answers

Basic overview of neurotransmitters?

<p>Synthesis and storage in presynaptic neuron, release by presynaptic axon terminal, produces response in postsynaptic cell</p> Signup and view all the answers

Where does acetylcholine act?

<p>Neuro-muscular junction (NMJ)</p> Signup and view all the answers

Where does dopamine act?

<p>Basal ganglia</p> Signup and view all the answers

Where do endorphins act?

<p>Inhibit pain by blocking substance P</p> Signup and view all the answers

Where does substance P work?

<p>Enhances perception of pain</p> Signup and view all the answers

Where do enkephalins work?

<p>Inhibit pain by suppressing release of substance P</p> Signup and view all the answers

2 types of summation?

<p>Spatial, temporal</p> Signup and view all the answers

What is spatial summation?

<p>Input from multiple cells</p> Signup and view all the answers

What is temporal summation?

<p>Effect of a series of synaptic potentials that occur within milliseconds of each other</p> Signup and view all the answers

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