There are many factors that affect blood pressure, including physiological and pathological. Physiological factors such as intense exercise, nervousness, sudden excitement and temporary increases, as well as increases after a full meal, are all normal reactions and are short-term influences. Cardiovascular activity in the human body is governed by sympathetic and parasympathetic nerves. The neurons involved are widely distributed in the nervous system from the spinal cord to the cerebral cortex at all levels. The cardiovascular centers refer to the successive levels of cardiovascular neurons in the hypothalamus, midbrain, pontine and metencephalon, which specifically govern the activity of the human heart and blood vessels, including the regulation of blood pressure. These activities are accomplished through various cardiovascular reflex activities, which are short-term factors, including two parts: 1. Cardiovascular reflexes: In the physiological state, the body in order to maintain a relatively stable internal environment, or so that the body can readily adapt to various changes in the external environment, there are a variety of receptors in the human body that can feel both internal and external to the body, and their main function is to feel a variety of cardiovascular movement Their main function is to sense various cardiovascular movements. The main receptors are pressure receptors, pressure receptors exist in the carotid sinus of the human neck and the aortic arch immediately adjacent to the heart, there are very rich sensory nerve endings under the outer membrane of the carotid sinus and the aortic arch vessel wall, the end of which is expanded in an oval shape, specializing in sensing changes in body pressure, for example, when a person exercises, arterial blood pressure from low to gradually increase, the above pressure receptors can feel the pressure in For example, when a person exercises and the arterial blood pressure rises gradually from low to high, the above pressure receptor can feel the pressure increasing, and when it increases to a certain degree, its nerve endings start to excite and issue nerve impulses, which enter the brain through the afferent nerve channels of the body, informing the center of the brain specializing in cardiovascular activities that the blood pressure is rising, and then affect the activities of the heart and blood vessels through the efferent nerve channels of the body, the total effect of which is to keep the heart’s activities from being too strong and the blood pressure from being too high, and to keep the blood pressure at a low level. This perceptive reflex is also called the decompression reflex. On the contrary, when the arterial blood pressure suddenly decreases, the aforementioned hypotensive reflex activity is weakened, which increases the cardiac output of the heart and increases the peripheral resistance of the blood vessels, reducing the decrease in blood pressure and bringing the arterial blood pressure back up to maintain blood pressure in a relatively stable range. 2, body fluid regulation: refers to the regulation of the heart and vascular activity by some chemicals contained in the blood and tissues. These chemicals are those that make blood pressure rise (such as adrenaline and norepinephrine, etc.) and those that make it fall (such as kinins and prostate, etc.). Their dynamic balance in the body contributes to the stability of blood pressure in the body.