The heart is innervated by parasympathetic and sympathetic fibers. The medulla is the primary site in the brain for regulating sympathetic and parasympathetic outflow to the heart and blood vessels.
http://emedicine.medscape.com/article/1923077-overview
In this lesson, you'll learn about two subdivisions of the autonomic nervous system-the sympathetic and parasympathetic nervous systems. Watch as a hiker, Phil, runs away from a terrifying bear and see how these systems react to the impending danger!
http://study.com/academy/lesson/the-sympathetic-and-parasympathetic-nervous-systems.html
Additionally, the autonomic nervous system can be further subdivided into two divisions: the sympathetic nervous system and the parasympathetic nervous system. Both of these systems control the same group of body functions, but they have opposite effects on the functions that they regulate.
http://study.com/academy/lesson/the-sympathetic-and-parasympathetic-nervous-systems.html
The parasympathetic nervous system uses acetylcholine as a  neurotransmitter to decrease heart rate and stimulate the digestive  system.
http://www.answers.com/Q/What_is_the_effect_of_parasympathetic_stimulation_on_the_heart
It would increase the heart rate as when the vagus nerve is stimulated (which is part of the parasympathetic system) it lowers the heart rate, if this stimulation was decrease … d then the heart beat would become faster.
http://www.answers.com/Q/What_is_the_effect_of_parasympathetic_stimulation_on_the_heart
Some of the effects of the parasympathetic nervous system are: 1. Heart rate is decreased. With the danger behind him, Phil no longer needs increased blood supply to his muscles, so the heart can slow down and conserve energy.
http://study.com/academy/lesson/the-sympathetic-and-parasympathetic-nervous-systems.html
Together, the epinephrine and norepinephrine secreted by the adrenal glands have the same basic effects as the nerves of the sympathetic nervous system by increasing heart rate, increasing bronchiole dilation, and increasing glucose release from the liver. In addition, norepinephrine is also known to increase alertness.
http://study.com/academy/lesson/the-sympathetic-and-parasympathetic-nervous-systems.html
Making the world better, one answer at a time. Both the parasympathetic and sympathetic nervous systems innervate the heart. The parasympathetic nervous system functions in regulating heart rate through the vagus nerve, with increased vagal activity producing a slowing of heart reate.
http://www.answers.com/Q/What_is_the_effect_of_parasympathetic_stimulation_on_the_heart
SNS = sympathetic nervous system. The afferent fibers of the autonomic nervous system of the heart share the same pathway with gastrointestinal, genitourinary, baroreceptors, and chemoreceptors and transmit signals to the medulla by cranial nerves X and IX.
http://emedicine.medscape.com/article/1923077-overview
The sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. The parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.
http://study.com/academy/lesson/the-sympathetic-and-parasympathetic-nervous-systems.html
the effect of the sympathetic nervous system on the heart is to
The effect of the sympathetic nervous system on the heart is for increasing heart rate, increasing bronchiole dilation, and increasing glucose release from the liver. The effect of the sympathetic nervous system on the heart is to increase heart rate, increase bronchiole dilation and increase glucose release from the liver.