Flow of signals in a synapse
The flow of signals in a synapse is from the axonal end of one neuron to the dendritic end of another neuron due to the structural and functional characteristics of the synapse.

Unidirectional nature of synapse
- The synapse is a junction between two neurons where communication occurs. It is designed to transmit signals in a specific direction to ensure efficient neural communication.
- The axon terminal of one neuron releases neurotransmitters into the synaptic cleft, which then bind to receptors on the dendritic end of the postsynaptic neuron.
- This unidirectional flow of signals ensures that information is transmitted from one neuron to the next in a coordinated manner.

Presynaptic and postsynaptic neurons
- The presynaptic neuron is the neuron sending the signal, while the postsynaptic neuron is the neuron receiving the signal.
- The presynaptic neuron releases neurotransmitters when an action potential reaches its axon terminal.
- The postsynaptic neuron has receptors on its dendritic end that detect these neurotransmitters and generate a new action potential if the signal is strong enough.

Role of neurotransmitters
- Neurotransmitters play a crucial role in signal transmission across the synapse. They are released by the presynaptic neuron and act as chemical messengers that relay signals to the postsynaptic neuron.
- The binding of neurotransmitters to receptors on the postsynaptic neuron triggers a series of events that lead to the generation of a new action potential.
In conclusion, the flow of signals in a synapse is unidirectional, from the axonal end of one neuron to the dendritic end of another neuron, to ensure efficient and coordinated neural communication. This directional flow is essential for proper functioning of the nervous system and for processing information accurately.