Rapid regulation of blood pressure: the role of the nervous system
A particularly important property of the BP-regulatory nerve is its rapid response, which begins in the first second and typically elevates blood pressure to 2 times normal within 5 to 10 seconds.
The function of local tissue control mechanisms plays a major role in regulating blood flow to tissues and organs of the body. Redistribution of blood flow to areas of the body, an increase or decrease in the pumping action of the heart, and a rapid correction of systemic arterial blood pressure.
The nervous system controls circulation mainly through the autonomic nervous system. In this chapter, we focus on anatomy and features and function.
The number one important function of the nervous system that regulates blood pressure is its ability to cause a rapid rise in blood pressure. To synchronous stimulation of vasoconstriction and cardiac function of the sympathetic nervous system. Simultaneously there is a reciprocal inhibition of the parasympathetic nerves through the X cord to the heart. Following are the three main changes that occur concurrently with an increase in blood pressure:
1. All arterioles of the systemic circulation constrict; elevation of total peripheral resistance increases blood pressure.
2. The veins contract strongly, so the blood is pumped from the large vessels in the periphery to the heart, thereby increasing the volume of blood in the heart chambers, making the myocardium fibres stretch, contract the heart with greater force, and increase the amount of blood being pumped. pump away. Hence increased blood pressure.
3. Finally, the heart is directly stimulated by the autonomic nervous system to increase the heart's pumping, caused by an increase in frequency, sometimes up to 3 times normal. In addition, sympathetic signalling directly increases the force of contraction of the heart muscle, increasing the amount of blood pumped. When sympathetic stimulation is strong, the heart can pump more than twice its normal level causing an acute increase in blood pressure.
Nerves rapidly regulate blood pressure. A particularly important property of the BP-regulatory nerve is its rapid response, which begins in the first second and typically elevates blood pressure to 2 times normal within 5 to 10 seconds. In contrast, rarely suppression can halve blood pressure in 10 to 40 seconds. Thus, neuro-regulation is the most rapid mechanism in arterial blood pressure regulation.