1. what is the function of the circulatory system? a. control the flow of oxygen in your body b. control the flow of nutrients in you body c. control the flow of blood in your body 2. what is the function of the respiratory system? a. control the flow of oxygen in your body b. control the flow of nutrients in you body c. control the flow of blood in your body 3. what is the function of capillaries? a. carry oxygen-rich blood to veins b. carry oxygen -depleted blood to veins c. pump oxygen through arteries 4. when your are sleeping, your resting heart rate is about1 beat per second a. true b. false 5. oxygen is stored in tiny sponge like sacs called a. aviary b. alveoli c. ravioli