Dopamine is a catecholamine neurotransmitter in the body. This neurotransmitter and nerve cells have an effect on learning, movement, memory, attention and brain pleasure in the human body. The effects of dopamine on various systems in the body are as follows: 1. It can excite the heart, directly agonize β1 receptors and promote the release of dopamine from nerve endings. 2. For the effects of blood vessels and blood pressure, it can agonize dopamine receptors and cause diastole of renal mesenteric and cerebral vessels and coronary arteries, and it can agonize α receptors to cause skin membrane and skeletal vasoconstriction, so that systolic blood pressure increases and diastolic blood pressure increases or remains unchanged. It can cause renal vasodilation, increased renal blood flow and renal filtration rate, which can directly inhibit sodium reabsorption by renal tubules and sodium excretion diuresis.