Right atrium> Right ventricle> Pulmonary arteries> Pulmonary capillaries> Pulmonary trunk> Pulmonary venules> Pulmonary veins.
The heart is an organ that acts as a pump to circulate blood. It can be as simple as a straight tube, as in spiders as well as annelid worms, or as complex as a mollusk with one or even more receiving chambers as well as a main pumping chamber. Fish hearts are folded tubes with three to four enlarged areas which correspond to mammalian heart chambers. The heart is indeed a four-chambered double pump at the center of the circulatory system in humans, other mammals, and birds.
The pulmonary circulation system transports deoxygenated blood from the heart to the lungs, where it is re-saturated to oxygen before being dispersed into to the systemic circulation.
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