How does blood change in the systemic circulation?

blood leaves the left ventricle and goes to the aorta, then into the arteries, into the arterioles here it has already carried all the oxygen through the tissues and diffuses through the capillaries, gas exchange takes place and venous, CO2-saturated blood flows through the venules, further along the inferior vena cava enters the right atrium, in the atrial systula, the tricuspid valve opens into the ventricle.

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