![]() The body’s cells need oxygen to function, and they produce carbon dioxide as a waste product. When blood travels through the pulmonary artery to the lungs, it passes through tiny capillaries that connect on the surface of the lung’s air sacs, called the alveoli. Systolic pressure: This shows how much pressure the blood creates against the artery walls during systole.ĭiastolic pressure: This shows how much pressure is in the arteries during diastole. The high number is the systolic blood pressure, and the lower number is the diastolic blood pressure. When a person takes their blood pressure, the machine will give a high and a low number. Systole: The ventricles contract and pump blood out of the heart as the atria relax, filling with blood again.
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