What is the role of receptor sites on the receiving neuron?

The correct choice highlights the critical function of receptor sites on the receiving neuron, which is to bind neurotransmitters released from the sending neuron. When neurotransmitters attach to these receptor sites, they trigger various responses that can influence the likelihood of the neuron producing an action potential. This binding can either facilitate or inhibit neural impulses depending on the type of neurotransmitter and receptor involved, thus playing a key role in communication between neurons.

This process is essential for the overall functioning of the nervous system as it allows for the modulation of signals required for tasks such as muscle movement, sensory processing, and various cognitive functions. The intricate interplay between neurotransmitters and their respective receptors is fundamental to synaptic transmission and the processing of information in the brain.