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...systems (physiology), in particular to understanding mechanisms like the heart, arteries, nerves, brain and so on. Health is seen as a state where all the parts of the body function normally, like a new repaired car. If bits go wrong—if the body is struck down by a virus, internal changes damage it, or parts wear out—it goes in for repair by specialists. This view...

...system' - note the prominent size and position of the amygdala. The brain stem (which lies below the brain regions shown in Figure A) is the oldest part of the brain, and messages pass to and from it without the need for conscious thought. This area is lower in the head and is also called the 'lower brain', because it consists of parts similar to those found in some very...