Pulmonary Circuit steps

First step of pulmonary circuit

contraction of the right ventricle pumps blood to the lungs via the pulmonary arteries

Step two

as the blood flows through the capillary beds in the left lung, and right lungs, it loads O2 and CO2

Step three

Oxygen rich blood returns from the lungs via the pulmonary veins to the left atrium of the heart

Step four

Next, oxygen rich blood flows into the heart’s left ventricle, which pumps the oxygen rich blood out of the body.

Step five

blood leaves the left ventricle via the aorta, which conveys blood to arteries leading throughout the body

Step six

the first branches leading from aorta are coronary arteries which supply blood to the heart

Step seven

branches along the aorta lead to capillary beds in the head and arms

Step eight

branches along the aorta then lead into the abdomen to capullary beds in abdominal organs and legs

Step nine

within capillary beds: net diffusion of O2 from the blood to the tissues and of CO2 into the blood

Step ten

capillaries rejoin forming venules which convey blood to veins

Step eleven

oxygen-poor blood from head, neck, and forelimbs is channeled into a large vein, the superior vena cava

Step twelve

the inferior vena cava drains blood from the trunk and hind limbs