1. during the exchange of air in your lungs, oxygen is being taken into your bloodstream while this substance is being released

microorganisms**
carbon dioxide
plasma
mucus
2. the gas exchange of oxygen to the bloodstream takes place in what part of respiratory system?
pharynx
bronchiole
alveoli**
trachea
3. maintaing a healthy weight allows the resportory system to work more effectivly because
oxygen is being delieverd more adequately ***
the heart does not have to pump as forcefully
the capillaries are constricted
the lung capacity allows for small amounts of air
4. if you choose to smoke your body will use this substance less efficiently.
microorganisms**
carbon dioxide
plasma
oxygen