Many blood vessels only have innervation from the division of the ans.

It is defined with low energy expenditure and normal bodily maintenance (resting and digesting). The parasympathetic division effect on many body functions is a calming. Sympathetic and the parasympathetic division are The two subsystems of ANS .These two divisions often innervate the same target organs and have cooperative or contrasting effects.  

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.