Inhibition of parasympathetic nervous system activity causes the salivary glands to become dry or produce less saliva. This is because the parasympathetic nervous system is responsible for stimulating saliva production and secretion.
Apomorphine activates the parasympathetic nervous system.
The sympathetic system causes the vessels to constrict (shut blood to core systems) and is often called the fight or flight response. The parasympathetic system causes the vessels to relax and is often called the feed and breed response.
Stimulation of the Parasympathetic nervous system causes an increase in digestive tract mobility. When stimulated the parasympathetic post-ganglionic neurons release a hormone called Acetylcholine. This causes the Digestive tract to increase its contractions. Counteracting this increase in digestive tract mobility is the sympathetic nervous system, which releases a hormone called noradrenaline which slows down the digestive tracts contractions. This is how the Parasympathetic Nervous System gets the name "rest and digest"
The parasympathetic nervous system does not stimulate the fight or flight response.
The sympathetic and parasympathetic nervous systems are subdivisions of the autonomic nervous system.
Parasympathetic system. (sympathetic is commonly referred to as the "fight or flight" system and the parasympathetic is referred to as the "rest and digest" system)
Bronchoconstriction is due to an activation of parasympathetic nervous system.
the parasympathetic nervous system.
The iris is not innervated directly, however the iris sphincter muscle is affected by the sympathetic and parasympathetic nervous systems. Sympathetic stimulation causes pupil dilation while parasympathetic nervous system causes pupil constriction. The parasympathetic response is quicker because of the proximity of a parasympathetic ganglion (ciliary ganglion) to the eye. The sympathetic response is slower because all sympathetic ganglia are confined to the spinal cord. This is the reason why people adjust faster to a bright shining light than darkness.
The parasympathetic nervous system allows the act of micturition. The sympathetic nervous system inhibits it.
The parasympathetic and sympathetic systems are branches of the autonomic nervous system.