Final answer:
Acetylcholine (ACh) is a chemical molecule that can be released from nerve cell A and bind to area I of nerve cell B.
Step-by-step explanation:
In the space on the left, you can sketch a chemical molecule called Acetylcholine (ACh) that is released from nerve cell A and binds to area I of nerve cell B.
ACh is a neurotransmitter involved in the transmission of nerve impulses. It is released from the presynaptic neuron into the synaptic cleft and binds to ACh receptors on the post-synaptic membrane of the second neuron.
By binding to the receptors, ACh relays the signal from nerve cell A to nerve cell B, allowing the transmission of the nerve impulse between the two cells.