10. Which event occurs in the circulatory system shown on the right, but not in the circulatory system shown on the left? A. The blood receives oxygen when it passes through body capillaries. B. Oxygenated blood returns to the heart before flowing through body capillaries. C The blood receives oxygen when it passes through a capillary bed in a respiratory organ. .D Blood travels only through blood vessels and not through open spaces called sinuses.