physio 2

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

Author

nlopez850

323825

Card Set

physio 2

Description

chptr8

Updated

2016-09-28T21:47:22Z

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