sympathetic nervous system


a: sympathetic nervous system ~
b: the accelerator


"Whereas the sympathetic nervous system is like the accelerator, the parasym- pathetic nervous system is like the brake "

Writer: Claudia M. Gold
Date: Sep 24 2014 11:39 AM

a: parasympathetic nervous system ~
b: rest and digest mechanism


"The sympathetic nervous system is often referred to as the "fight or flight" response,
since it is activated during physically or mentally stressful situations. It is responsible for
HR raising due to the increase in the
SA stimulation and for increasing the
strength of contractions due to an increase in the propagation velocity of the depolarization wave that travels through the heart (slower response - about 5 seconds). The
parasympathetic nervous system is like the "rest and digest" mechanism, since it slows down the HR, decreases the Blood Pressure (BP), and increases the digestive system
activity (faster response - less than 1 second). "

Writer: Jose Miguel Medeiros
Date: Aug 15 2014 5:50 PM

Green Venn Diagram

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