Which statement best describes natural selection?
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Deoxygenated: jugular vein, superior vena cava, right atrium, great cardiac vein, pulmonary trunk and arteries. Oxygenated: descending aorta, left ventricle, coronary arteries, carotid artery.
<h3>How does the circulatory system work?</h3>Two circuits compose the circulatory system
- Lung circulation
1- Deoxygenated blood goes from the heart to the lungs where releases CO₂
2- Blood gets oxygenated again by absorbing O₂.
3- CO₂ is exhaled and oxygenated blood returns to the heart.
- Systemic circulation
1- Oxygenated blood moves to all tissues.
2- Deoxygenated blood returns to the heart.
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