Which of the following are tiny sacs in a synaptic knob that release chemicals into the synapse?

A) synaptic vesicles
B) synaptic nodes
C) terminal buttons
D) synaptic gaps

Synaptic vesicles are tiny sacs that store and release chemicals, known as neurotransmitters, into the synapse, which is the small gap between the synaptic knob of one neuron and the dendrite or cell body of another neuron. The neurotransmitters then bind to receptors on the postsynaptic neuron, influencing its electrical activity. Synaptic nodes and terminal buttons are terms often used synonymously with synaptic knobs, but they do not specifically refer to the vesicles that release neurotransmitters. The term "synaptic gaps" is incorrect as it does not refer to any structure within the synaptic knob.