When blood reaches the lungs,what does it unload?

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The pathway of blood through the heart is as follows: Blood enters the right atrium of the heart from the superior and inferior vena cavae. Blood passes through the tricuspid valve to the right ventricle. Blood is forced through the pulmonary valve to the pulmonary trunk. Blood travels through the pulmonary trunk to the pulmonary arteries. Blood travels to the lungs where CO₂ is unloaded and O₂ is loaded. Blood returns to the heart from the lungs through the four pulmonary veins to enter the left atrium. Blood passes through the bicuspid (mitral) valve to the left ventricle. Blood is forced through the aortic valve to the aorta. Blood travels from the aorta to the rest of the body. Blood returns to the heart through the superior and inferior vena cavae.

When Blood Reaches the Lungs,what Does It Unload