The <u>nervous system</u> is one of the most sophisticated communication systems on the planet.
<u>Explanation:</u>
The diverse assembly of nerves and specific cells identified as neurons which are responsible for coordinating actions and sensory by sending signals among the various parts of the body, thus collectively understood as the nervous system. By fact it is the electrical circuitry of the body.
The nervous system is systemically composed of two parts: the pivotal nervous system and the peripheral nervous system. Here the pivotal comprises of the brain and spinal cord, although the peripheral constitutes primarily of nerves, which are interconnected strings of long fibers or axons, which link the pivotal to every other part of the organism.
<span>After release into the synaptic cleft, neurotransmitters interact with receptor proteins on the membrane of the postsynaptic cell,
causing ionic channels on the membrane to either open or close. When
these channels open, depolarization occurs, resulting in the initiation
of another action potential</span>
I think answer is B. Sorry if it is wrong.
<u>substrate</u> fits into the <u>active site</u>, so the answer is C
