Final answer:
Kinesins move cargo from the cell body of neurons along microtubule tracks in the axons to the nerve endings, while dyneins transport the cargo in the opposite direction back to the cell body.
Step-by-step explanation:
Kinesins move cargo from the cell body of neurons along microtubule tracks in the axons, reaching the nerve ending where they become synaptic vesicles. On the other hand, dyneins, which are ATP-dependent motor proteins, transport cargo in the opposite direction from the nerve ending back to the cell body. These motor proteins play a crucial role in transporting cargo such as vesicles containing neurotransmitters within cells.