AP BIOLOGY

Detailed explanation-1: -Your heart and blood vessels make up the circulatory system. The main function of the circulatory system is to provide oxygen, nutrients and hormones to muscles, tissues and organs throughout your body.

Detailed explanation-2: -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.

Detailed explanation-3: -Answer and Explanation: The liver, brain, and heart consume the most oxygen in the body. The liver consumes 20.4%, the brain 18.4%, and the heart 11.6%.

Detailed explanation-4: -Organ systems work together, too. For example, the respiratory system and the circulatory system work closely together to deliver oxygen to cells and to get rid of the carbon dioxide the cells produce.