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physio 2
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Electrical synapse characteristics
Two neurons linked together by gap junctions
Bidirectional communication
Ions or second messengers
Rapid communication
e.g retina, cortex, cardiac muscle
Chemical synapses characteristics
Narrow space in between
Unidirectional
Neurotransmitters
Usually synapse on dendrites(e.g axodendritic
: axon to dendrites)
Describe Signal transduction across the chemical synapse
Function: causes depolarization, closer to threshold
Excitatory postsynaptic potential
Define divergence
Single neuron communicates to several other neurons
Function: Causes hyperpolarization, further away from threshold
Inhibitory postsynaptic potential
Define Convergence
Single neuron receives communication from different neurons
Define summation
When threshold is reached
: Action potential
When threshold is not reach
: No action potential will occur.
(All or none properties of action potential)
Steps in Acetylcholine synthesis
Steps in Acetylcholine breakdown (degradation)
What are 2 types of Acetylcholine receptors
Nicotinic cholinergic receptor
Receptor can bind to both acetylcholine and nicotine
Ionotropic= Channel-linked receptor- Excitatory postsynaptic potential
e.g increase muscle contractility
Muscarinic cholinergic receptor
Receptor can bind to both acetylcholine and muscarine drug
Metabotropic= G-protein coupled receptor
can be excitatory or inhibitory depending on the receptor subtypes
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Author
nlopez850
ID
323825
Card Set
physio 2
Description
chptr8
Updated
2016-09-28T21:47:22Z
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