Identify the location and function of the following structures:
$(1)$ Synaptic Knob
$(2)$ Bipolar nerve cell

(N/A) $(1)$ Location: The distal branched ends of an axon are swollen and are called synaptic knobs.
Function: They contain synaptic vesicles that store and release neurotransmitters to facilitate signal transmission across the synapse.
$(2)$ Location: These are found in the retina of the eye.
Function: They are responsible for the conduction of nerve impulses from photoreceptor cells to ganglion cells.