The circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart. The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide.
A sudden onset of difficulty breathing, sharp chest pain and cyanosis that persists despite supplemental oxygen is most consistent with<u> a pulmonary embolism.</u>
