The sympathetic nervous system is a part of the autonomic nervous system that carries stress responses or "flight or flight" responses that involves feelings of rush. The activation of sympathetic nervous system therefore increases the heart rate. The parasympathetic nervous system is another part of the autonomic nervous system which is responsible for "rest and digest" responses that involves feelings of relaxation. The activation of the parasympathetic nervous system decreases the heart rate.
Yes. An example is Methyl Alcohol, absorbs water. (CH3OH) Two elements can form different types of bonds and end up with different compounds. There is a small amount of elements. There is a bigger number of compounds.
