For example, If, hypothetically, you were running away from a threat, you wouldn’t need to spend any extra blood digesting your last meal - you would instead need it to to flow into your muscles to run away and survive! It increases your heart rate and decreases blood flow away from non-essential organs. This system is in charge of all the things that get your body ready for activity. The parasympathetic nervous system also controls digestion - from the secretion of gastric juices and moving contents down the digestive tract. Filling up your bladder (thankfully not emptying it) is done without you knowing it, until those stretch muscles send an impulse that gets you on the path to find a restroom nearby. The involuntary rest and digest portion of the nervous system. This kind of response is thanks to the sympathetic and parasympathetic nervous system which controls things that you don’t have to tell your body to do - thankfully - like breathe, digest, and make your heart beat. You might have felt butterflies in your stomach, or started sweating and turning white - these are the involuntary signs of your nervous system at work. You’ve probably heard about the stress response: “ fight or flight” especially when it comes to scary things like fighting a bully on the playground, or standing up and giving a big presentation. Reasons why it happens: 'Fight or Flight' or 'Rest and Digest'
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