1.Which of the following systems work together to transport oxygen-rich blood and nutrients throughout the body?
a.skeletal and muscular systems b.respiratory and digestive systems
c. circulatory and endocrine systems
d. respiratory and circulatory systems

2.In what specific respiratory organ does exchange of gases in the lungs occur? a.alveoli b. bronchi
c. trachea d. bronchioles

3.When we inhale, what is the pathway of air into the lungs?
a.Nasal cavity-pharynx-larynx-trachea-bronchi-bronchioles-alveoli
b.Nasal cavity-larynx-pharynx-trachea-bronchi-bronchioles-alveoli
c.Nasal cavity-larynx-pharynx-trachea-bronchioles-bronchi-alveoli
d.Nasal cavity-pharynx-larynx-trachea-bronchioles-bronchi-alveoli

4.Which of the following is true?
a.The blood returns to the left atrium and the cycle is repeated.
b.The blood enters the right ventricle, which pumps it into the systemic circuit.
c.The gas exchange occurs in the pulmonary capillaries (oxygen into the blood, carbon dioxide out), and blood high in oxygen and low in carbon dioxide is returned to the left atrium.
d.The pulmonary capillaries conduct blood into the left atrium, which pumps the blood into the left ventricle, which in turn pumps oxygenated blood into the aorta and on to the many branches of the systemic circuit.

5.Which of the following system is responsible for taking in oxygen and removing carbon dioxide?
a. digestive system b. endocrine system c.circulatory system d. respiratory system

6.Oxygen moves from alveoli to the blood through these tiny blood vessels that line the alveoli walls called_____.
a. air tubes b. bronchioles
c. capillaries d. cilia

7. Respiratory System: gas; Circulatory System: ____
a. blood b. carbon dioxide
c. oxygen d. red blood cells

8. During exercise, you need more oxygen because the cells __.
a. begin to die b. need it for energy
c. produce more carbon dioxide
d. all of the above

9.The organ of the circulatory system that pumps blood is _.
a.heart b. blood
c. blood vessels d. lymph node

10.What is the liquid component of the circulatory system that transports nutrients and oxygen to the different parts of the body?
a.heart b. blood
c. blood vessels d. ventricles

11.What is the process of taking in oxygen? a.inhalation b. exhalation
c. circulation d. respiration

12.Which of the following describes pulmonary circulation?
a.It involves the heart, the blood vessels, and all body parts. b.It involves the renal arteries, wherein it leads blood to your kidney.
c.It involves the lungs as oxygen supplier and absorber of carbon dioxide.
d.It involves the extensive system of veins that leads from the spleen, stomach, pancreas, intestine and colon.

13. Which type of circulation fed heart with the blood passing through the coronary arteries and leads it to capillaries attached to the heart?
a. renal circulation b.systemic circulation c. coronary circulation
d.pulmonary circulation

14.Which of the following is TRUE about exhalation?
a.Air is forced out.
b.Lungs are stretched.
c. Diaphragm moves down.
d. Air flows in from the nose.

15.Why gases can easily diffuse across the membrane of alveolus?
a.It has coarse hairs that filter the air.
b.It has mucus that acts as lubricants.
c. It is lined with cilia that sweep the gas.
d. It is surrounded by tiny blood vessels.​