Mean lean human machine

The human body is comparable to a machine in that the parts are segregated mechanistically for specific purposes, including the autonomic and somatic nervous systems. All parts of the body work together, much like the wheels in a clock in that every part must function properly in order for the machine to achieve its purpose, which in this case is the replication of DNA and the propagation of a species. Like all machines, the human body requires "fuel" in order to function. The fuel of our bodies is of course, the food and oxygen we consume. In a sense, the fundamental requirements of a human are strictly mechanical. Like a broken-down car on the side of the road, the depletion of the energy source leaves the human body unable to function. I personally don't like being compared to my laptop, so I tend to lean toward the brain and emotions as the separation factors between Man and machine. However, the brain is even subdivided, with each section having specific functions. The brain has receptors that regulate every single action in the body, including our emotions. So it is possible that when we are displaying emotion a portion of our brain is performing its mechanical duty in response to an outside stimulus. The same is true for learning. Our brains are programmed to learn. I guess the only question I have out of all of this is, how are we so intricatlely programmed?