Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.
sympathetic nervous system<span> can accelerate heart rate; widen bronchial passages; decrease motility (movement) of the large intestine; constrict blood vessels; </span>increase<span> peristalsis in the esophagus; cause pupillary dilation, piloerection (goose bumps) and perspiration (sweating); and raise blood pressure </span>
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