Study Guide: Circulatory and Respiratory Systems

1.	 What are the 3 major parts of the circulatory system?

2. 	The roads of a city are similar to what structures in the circulatory system?

3. 	In the walls of the heart, the thick layer of muscle is called the ___________.

4. 	Compared with the walls of arteries, are the walls of veins thicker or thinner?

5. 	What are the smallest of the blood vessels (hint: they are usually 1 cell thick)?

6. 	Which are the 3 basic types of blood vessels?

7. 	What is the function of valves in the human circulatory system?

8. 	When an infection occurs, does the number of white blood cells increase or decrease?

9. 	What are the major functions of blood?

10. 	What is the composition of plasma?

11. 	About how much blood does the human body contain?

12. 	Which type of blood cell contains hemoglobin?

13. 	The process by which oxygen and carbon dioxide are exchanged between cells, the blood, and air in the lungs is called _______________.

14. What flap of tissue fails to cover the trachea, when a person gets food stuck in his or her windpipe?

15. 	What structure serves as a passageway for both air and food?

16. 	Where is air filtered, warmed, and moistened as it enters the body?

17. 	Do humans have an open circulatory system?

18. 	What are the flaps of connective tissue located between the atria and the ventricles called?

19. 	Which is the first number of a blood pressure measurement, systolic or diastolic pressure?

20. 	What is the piece of cartilage that covers the entrance to the trachea when you swallow called?