Blood pressure is the force exerted by blood on vessel walls as the heart pumps and relaxes. Systolic pressure occurs when the heart contracts while diastolic pressure is when the heart relaxes. Blood pressure ensures blood flow to organs and facilitates gas/nutrient exchange and urine/lymph formation. Common types include normal, high (hypertension), and low (hypotension) blood pressure. Blood pressure is measured non-invasively with devices and following guidelines around patient position and state. Factors like stress, diet, exercise impact blood pressure, which baroreceptor and chemoreceptor reflexes along with the renin-angiotensin system help regulate.