Circulatory System Quiz 21 (20 MCQs)

Quiz Instructions

Select an option to see the correct answer instantly.

1. These are flaps of tissue that keep the blood from flowing backwards.

Correct Answer: C) Valves.

2. Which system is responsible for making red blood cells?

Correct Answer: A) Skeletal.

3. Pepsin breaks down .....

Correct Answer: C) Proteins.

4. The Circulatory System is made up of

Correct Answer: B) Heart, Arteries and Veins.

5. Except the pulmonary vein, veins carry blood with a high concentration of

Correct Answer: A) Ill.

6. This component of blood serves our bodies defense against foreign pathogens.

Correct Answer: C) Leukocytes.

7. Blood vessels that return blood to the heart

Correct Answer: B) Veins.

8. Which body system converts food into simpler substances for the body to absorb as nutrients?

Correct Answer: A) Digestive system.

9. What will happen if a heart suddenly stops functioning because of a blockage in the arteries?

Correct Answer: B) A person will have a heart attack.

10. Red blood cells .....

Correct Answer: C) Carry oxygen to every part of your body.

11. Our heart beats about ..... times every minute.

Correct Answer: B) 70 to 80.

12. Which of the following sets of statements is correct?

Correct Answer: A) Blood entering lungs is oxygen-poor;Blood leaving lungs is oxygen-rich.

13. What determines whether the blood can be positive or negative?

Correct Answer: A) Rh factor.

14. Which of the following is not a part of the circulatory system?

Correct Answer: B) Liver.

15. Which blood vessels carry deoxygenated blood to the heart?

Correct Answer: D) Veins.

16. How long do erythrocytes live?

Correct Answer: B) 100-120 days.

17. Atri/o

Correct Answer: A) Atrium.

18. Lower chambers of the heart.

Correct Answer: B) Ventricles.

19. Gas that we breathe out

Correct Answer: A) Carbon dioxide.

20. What do we call the blood vessels that carry blood AWAY from the heart?

Correct Answer: B) Arteries.