Which structure (s) on the neuron in model 1 would receive a signal from either a sensory cell (taste bud, touch receptor, retinal cell) or from another neuron?

Dendrites receive the signal from either a sensory cell or another neuron. It is the receiving end of the neuron. It receive electrochemical signals or as postysynaptic potentials. It conducts impulses toward the cell it is the branching process of a neuron.