Chemical synapse - fast transmission, precise direction, amplified signal (more in human brain)
Electrical synapse - extremely rapid transmission
- Presynaptic membrane = membrane of terminal button
- Postsynaptic membrane = membrane of receiving neuron
- Synpatic cleft-gap = contains extracellular fluid
- Synaptic vesicles = contain transmitters
Neurones communicate across synapses - most are axodendritic (axon on dendrites) while some are axosomatic (axon on cell bodies). Rarely they can be dendodendritic (capable of transmission in opposite direction) and axoaxenic (pre-synaptic inhibition).
1. Neurotransmitters are released at short distance
2. Neuromodulators are released in large amounts at longer distance
3. Hormones are released by endocrine glands, widespread action to target cells
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