1. your respiratory system is the system in your body that is responsible for breathing.
true
false
2. the lungs are made up of thick fibrous tissue.
true
false
3. internal respiration takes place in the alveoli.
true
false
4. the alveoli are located at the end of the bronchi.
true
false
5. the hemoglobin in blood combines with oxygen when the blood flows through areas where oxygen concentration is high.
true
false
6. marijuana does not contain carcinogens.
true
false
7. it is more difficult to stop smoking cigarettes if you use marijuana regularly.
true
false
8. it takes as long as 3 days for the body to eliminate the chemical effect that marijuana has on the body.
true
false
9. the drug thc acts as a stimulant and can improve strength, balance, and coordination.
true
false
10. people who quit smoking usually cannot reverse the adverse affects caused by cigarettes.
true
false