1. Why is oxygen important to blood and to the cells?
A. Oxygen helps the blood to clot
B. Oxygen brings food to the cells.
C. Oxygen is necessary for cell growth and energy.
D. Oxygen is not important -- carbon dioxide is the most important substance
2. What is the main function of the blood in circulatory system?
A. Pumps the blood throughout the body.
B. Where the carbon dioxide is absorbed.
C. Where the exchange of gases and nutrients take place
D. Carries the gases, nutrients, and other molecules to and from the different parts of the body
3.Which type of circuit/ circulation is responsible for the movement of blood from the heart to the lungs and back to the heart?
A. Pulmonary Circulation C. Systemic Circulation
B. Coronary Circulation D. All of the above
4. Which of these diseases that a person may experience breathing difficulty because of the mucus or phlegm forms in the airways obstructing the flow of oxygen into the lungs?
A. Common cold
B. Asthma
C. Bronchitis
D. Influenza ​