The ras system refers to the renin-angiotensin system, which is an important humoral regulatory system in the human body that regulates water and electrolyte balance as well as blood pressure level. 1. The ras system is an important humoral regulatory system in the human body, and its main components include renin, angiotensin and aldosterone, which mainly act on the cardiovascular system to regulate blood pressure and blood volume, and to maintain the functional balance of the body. 2. Transitional activation of the ras system can lead to hypertension and imbalance of water and electrolyte balance in the body. 3. The ras system is an important fluid regulation system in the body and plays an important role in maintaining homeostasis. If abnormalities of the ras system occur, it is necessary to consult a doctor in a timely manner and standardize the treatment under the guidance of the doctor to avoid delaying the condition.