Dilating

... cells. ANS? Autonomic Nervous System. Y'know, sympathetic, parasympathetic, reactions that occur in your body against a stimulus, i.e. pupils dilating, err.. bladder, yeah, you got it. Wait a sec... Here: http://en.wikipedia.org/wiki/Autonomic_nervous_system Covered well in Campbell and Reece ...

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... many complex molecular structures. Sensitivity - All organisms respond to stimuli. Such as plants growing toward a source of light or your pupils dilating when you walk into a dark room. Growth, Development, and Reproduction - All organisms are capable of growing and reproducing. All possess hereditary ...

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msucles in arteries are also responsible for dilating so that more blood can run through it. The example the boys all know: penile erection. This process is under influence of the parasympathetic and sympathetic nervous system.

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