University of Central Florida (UCF) ZOO3744 Neurobiology Practice Exam 2

Synaptic transmission plays a crucial role in neuronal communication and can have varying effects on a postsynaptic neuron, making the correct answer that it can either excite or inhibit the neuron. When neurotransmitters are released into the synaptic cleft and bind to receptors on the postsynaptic membrane, they can lead to different changes in the postsynaptic neuron's membrane potential.

Excitatory neurotransmitters, such as glutamate, typically lead to depolarization of the postsynaptic neuron by allowing positive ions (like sodium) to flow into the cell. This depolarization can bring the membrane potential closer to the threshold needed to initiate an action potential. On the other hand, inhibitory neurotransmitters, such as gamma-aminobutyric acid (GABA), can cause hyperpolarization, making the interior of the neuron more negative and moving the membrane potential further away from the threshold for firing an action potential.

This dual capability of synaptic transmission is essential for the complexity of neural processing, allowing for sophisticated regulation of neuronal activity and enabling the nervous system to modulate responses based on different stimuli and circumstances. Hence, the effect of synaptic transmission is not uniform; it encompasses both excitation and inhibition depending on the nature of the