Final answer:
The dendrites are the parts of a neuron that receive incoming information from external sources, serving as the main input sites for the cell.Option 1 is the correct answer.
Step-by-step explanation:
The site in a neuron that receives incoming information from external sources is the dendrites. Each neuron has a cell body, or soma, that contains the nucleus and major organelles necessary for the cell's function. Extending from the soma are the dendrites, which are branching extensions that serve as the main input sites for the cell. They receive signals from other neurons at synapses, the points of contact where information is transmitted from one neuron to another. After receiving signals, the dendrites transmit these signals to the soma.
From the soma, electrical impulses are integrated at a specialized structure called the axon hillock, after which the integrated signal is propagated down the axon, leading towards the axon terminals, where they can synapse on other neurons, muscle cells, or glands.
In a neuron, dendrites function as key input sites, receiving signals from other neurons at synapses. The soma, housing the nucleus and organelles, processes these signals. Integrated impulses reach the axon hillock, initiating their transmission down the axon towards terminals for further synaptic connections or cell responses.