Question

a neural ______ or, chemical messenger, travels across the synapse and binds to a neural ______

transmitter...receptor
transmitter...transmitter
receptor...transmitter
receptor...receptor

Explanation:

Identify the chemical messenger

A chemical messenger in the nervous system that travels across the synaptic gap is called a neurotransmitter (or neural transmitter).

Identify the binding site

The neurotransmitter travels across the synaptic cleft and binds to a specific protein structure on the postsynaptic membrane called a receptor (or neural receptor).

Match with the options

The first blank is "transmitter" and the second blank is "receptor". This corresponds to the first option: "transmitter...receptor".

Answer:

• transmitter...receptor (Correct answer)
• transmitter...transmitter
• receptor...transmitter
• receptor...receptor