What are the characteristics of presynaptic neuron potentials?

1. Presynaptic neuron potentials are action potentials that travel along the axon of the presynaptic neuron.

2. These potentials are initiated at the axon hillock and propagate down the axon towards the axon terminals.

3. Presynaptic neuron potentials are all-or-nothing events, meaning that once the threshold for activation is reached, the action potential will be generated and propagate along the axon.

4. The amplitude and duration of presynaptic neuron potentials are relatively constant, ensuring reliable transmission of signals to the postsynaptic neuron.

5. Presynaptic neuron potentials are typically depolarizing events, where the membrane potential of the neuron becomes more positive.

6. The frequency of presynaptic neuron potentials can vary, with higher frequencies corresponding to stronger signals being transmitted to the postsynaptic neuron.

7. Presynaptic neuron potentials can be modulated by various factors, such as neurotransmitters, hormones, and other signaling molecules, which can affect the strength and duration of the signal transmitted to the postsynaptic neuron.

- Graded potentials: Presynaptic neuron potentials are graded, meaning that their amplitude can vary depending on the strength of the stimulus.
- Depolarizing: Presynaptic neuron potentials are depolarizing, meaning that they cause the membrane potential of the neuron to become more positive.
- Transient: Presynaptic neuron potentials are transient, meaning that they last for only a short period of time.
- Triggered by neurotransmitters: Presynaptic neuron potentials are triggered by the release of neurotransmitters from the presynaptic neuron.