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Below, an image that depicts the human neuron:

And

The McCulloch-Pitts neuron works like a logic gate, where:

• The dendrites are the inputs
• The axon is the output that can be linked to other neurons
• The nucleus of the cell receives all the inputs

Furthermore, if the accumulated signal, in the nucleus, exceeds a threshold an output signal is generated and that will be passed on by the axon.

A logic schema below:

Image Added

Where:

• x₁, x₂ … x_n are the input values
• w₁, w₂ … w_n  are the weights on each inputs
• sum = x₁ * w₁ + x₂ * w₂ + … + x_n * w_n 
• if sum > threshold output is 1 (or true) else it is 0 or (false)