How is the work of the vessels?

After meeting vessels, we know now that they are not passive transmitters blood. Voltage walls, and with it the lumen of them may change, exerting a significant influence on blood circulation.
These changes of the lumen of the vessels, especially arterioles, control those same nerves, which change the heart. Thus amplifying the heart of the sympathetic nerve narrows most arterioles and thereby increases the blood pressure. Inhibiting the work of the heart vagus nerve simultaneously lowers blood pressure, reduces than lying at the heart of the load. The impact of these nerves on the heart and blood vessels occur in the already familiar to us law reflex.
For example, if you push hard on the eyeballs through closed eyelids, the heart rate slows down. Signals from irritated sensitive nerves of the eyeball are running in the brain and there are transferred to the centers of the vagus nerve, which fly orders that slow down the heart. This experience is unsafe, and to repeat it for fun not necessary.
Other techniques reflexes related to the vessels are extending them, and redness of the skin with its thermal irritation and opposite phenomenon - blanching skin - under the influence of the cold.
Especially important reflexes, helps to maintain the consistency of blood pressure. In the aorta, carotid artery and in some other vessels are sensitive nerve endings (receptors), sensitively reacting to changes in blood pressure. If the pressure increases, these receptors send to the brain impulses, exciting centre of the vagus nerve. The last lower the pressure to normal. If, on the contrary, the pressure for some reason falls from vascular receptors are running in the brain signals that give advantage of the sympathetic nerve, and the pressure rises. Thus, normal pressure in the arteries is supported by constant complex interaction of both vehicles and clear feedback in the regulatory system. Hypertension therefore arises that these regulatory mechanisms upset, are broken and how would configured on a false standard.