Arteries play a more active role in regulating blood pressure. The brain is a part of the sympathetic nervous system, which is used to understand the fluctuations in blood pressure through a special sensor on the wall. They feel the pressure of the arterial wall to rise or fall, and this kind of information is transmitted to the brain. When the brain receives a signal of high blood pressure, it sends out information to relax the blood vessels through the collection of nerve cells (blood vessels).
The brain also monitors the amount of oxygen and nutrients the body needs. It regulates blood pressure and blood flow to ensure that the needs of each organization can be met. When the body rests, the brain lowers blood pressure, when the body is under a variety of stress (including the pressure of wake up), the brain will be high blood pressure. The help of the blood vessels to relax the nerve to the changes is to tell the arteries to relax (to lower blood pressure) or to shrink (L hypertension).
As mentioned above, the brain through. Inform. Adrenaline and norepinephrine are the way to get the body ready for the unexpected. These hormones are suitable for a specific organization, like a key to open a lock, the lock is called a receptor, and when the hormone enters, it will start a specific action. The heart also has this “lock”, it is called a receptor. When adrenaline and norepinephrine enter the receptors, the heart beats faster. E- receptors were also in the kidney. When adrenaline and norepinephrine enter these receptors, the kidneys are stimulated to produce renin. There is a drug known as e- receptor blocker, which is the role of the receptor to enter the target and prevent the increase of blood pressure and adrenaline and norepinephrine.
Epinephrine and norepinephrine also enter the a- in the arteries. When this happens, the arteries will shrink, and then the blood pressure will rise. The number of calcium in the muscle cells is dependent on the wall of the arteries and veins. This contraction is caused by a small amount of calcium entering the cell through a tiny channel called the calcium channel. You may have heard of a drug called calcium antagonists, which block the contraction of the vessel wall by blocking the passage of calcium into the cell. The A receptor blocker is a drug that acts by stopping the contraction of adrenaline and noradrenaline.
In the last section, the renin is released from the kidney and other tissues such as the liver, which is released when the body needs to rise. However, renin does not directly affect blood pressure. More specifically, it triggers a chemical reaction that causes one to be converted into another protein, which is converted to angiotensin. If angiotensin encountered vascular angiotensin-converting enzyme, angiotensin converting enzyme, you may heard of angiotensin converting enzyme inhibitor, Yuan is a stop the drugs). This produces another product called vascular angiotensin “. Angiotensin is an active chemical, which can cause arterial contraction and release of aldosterone. Renin angiotensin aldosterone system has not been fully studied, but the study shows that it is essential for the development of hypertension. , a new type of drug called angiotensin blockers is interfering with the effect of this potent chemical.
Many other factors affect the blood vessel resistance. Too much liquid and increase the volume, make the organization become stiff. Arteries must be harder to shrink to the blood into the tissue, blood pressure and so on.
Blood pressure increases with age, and this is because the arteries become more rigid and less flexible, resulting in more resistance to blood flow. Many of the arteries will become narrow and blocked by the accumulation of fat debris over the years, thereby increasing peripheral resistance, which can lead to higher blood pressure.