what does systematic and pulmonary circulation have in common? and difference?

Answer 1

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Answer 2

Since the pulmonary circulation is in series with the systemic circulation, blood flow is the same in both circuits

Pulmonary circulation is the portion of the cardiovascular system which carries oxygen-depleted blood away from the heart, to the lungs, and returns oxygenated blood back to the heart.

Systemic circulation is the portion of the cardiovascular system which carries oxygenated blood away from the heart, to the body, and returns deoxygenated blood back to the heart

However, vessel walls of the pulmonary vasculature are much thinner and contain less smooth muscle than corresponding segments in the systemic circulation.

In spite of similar blood flow rates, vascular pressures are considerably lower in the pulmonary than in the systemic circulation (see bottom figure). figure Pulmonary arterial pressure averages 13 to 19 Torr (18 to 25 cm H2O), compared to 90 to 100 Torr in systemic arteries.
The lower pulmonary vascular pressure is largely accounted for by the lack of high resistance arterioles that are characteristic of systemic arteries