The chemical messengers released into the junctions between neurons are called A synapses. B neurotransmitters. C hormones. D drugs.

## Step 1<br />The question is asking for the name of the chemical messengers that are released into the junctions between neurons. These junctions are known as synapses.<br /><br />## Step 2<br />The options provided are:<br />A. Synapses<br />B. Neurotransmitters<br />C. Hormones<br />D. Drugs<br /><br />## Step 3<br />We need to identify which of these options is the correct term for the chemical messengers released into the junctions between neurons.<br /><br />## Step 4<br />Synapses are the junctions between neurons, not the chemical messengers. Hormones are chemical messengers, but they are released into the bloodstream, not the junctions between neurons. Drugs are substances that can alter the function of the nervous system, but they are not naturally occurring chemical messengers.<br /><br />## Step 5<br />Neurotransmitters are the chemical messengers that are released into the junctions between neurons. They carry signals across a synapse from one neuron (nerve cell) to another 'target' neuron.