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Name _________________________________
Circulatory System
Read chapter 33.1 (p. 948-952) and carefully examine the diagrams. Then, using the information in your book, answer
the questions in this packet. Please work carefully – you are responsible for this information!
1. List three functions of the circulatory system:
2. About how big is your heart?
3. Your heart is divided into 4 compartments called chambers. List the 4 chambers of the heart:
4. The upper chambers are called ______________ and receive blood from _____________________, while the
lower chambers are called _________________ and pump blood ___________________________.
5. What is the function of the septum?
6. What is the function of valves? Where are they located?
7. How does the heart muscle get the oxygen and nutrients it needs to pump continuously?
8. The heart functions like a pair of two pumps. The right side of the heart is involved in _______________
circulation and pumps oxygen rich/poor (circle one) blood from the heart to the ________. The left side of the
heart is involved in ____________________ circulation and pumps oxygen rich/poor (circle one) blood to the
rest of the body.
9. Arteries are large blood vessels that carry blood __________ from the heart. All arteries except the
______________________ carry oxygen-rich blood. Very small arteries that deliver blood to capillaries are called
________________.
10. The smallest blood vessels are ___________________. They receive blood from ___________________, and
their thin walls allow oxygen and nutrients to diffuse from blood into tissues, and ____________________ and
other waste products to diffuse from the tissues and into the blood.
11. When capillaries unite, they form _________________, small vessels that form ____________. Blood returns to
the heart through these blood vessels.
12. Explain how blood is able to flow through veins against gravity and back toward the heart.
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13. Arrange the following types of blood vessel in the correct order as blood would flow through them from the
heart to the body and back to the heart again.
A. other veins B. capillaries C. arterioles D. venules E. other arteries F. vena cava G. aorta
Heart
............
............
............
............
............
............
............
14. Label the heart diagram below.
1. ____________________________
9. ____________________________
2. ____________________________
10. ____________________________
3. ____________________________
11. ____________________________
4. ____________________________
12. ____________________________
5. ____________________________
13. ____________________________
6. ____________________________
14. ____________________________
7. ____________________________
15. Aorta to lower body____________
8. ____________________________
16. Septum (add this to the diagram)_
Heart
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15. On the diagram on page 2, use arrows to trace the blood flow in the human heart. Use red arrows to
represent oxygenated blood and blue arrows to represent deoxygenated blood.
16. Complete the following table which names the major blood vessels that connect to the heart and
identify where they come from and where they lead to:
Blood vessel
name
Aorta
Comes from
Leads to
Carries oxygen
rich/ poor blood
the body
lungs
oxygen rich
the lungs
the upper body
oxygen poor
Inferior Vena
Cava
17. In the diagram below, color the blood vessels that carry oxygen-rich blood red, and the blood vessels that carry
oxygen-poor blood blue. Then add arrows to depict the direction of blood flow.
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True or false?
18.
19.
20.
21.
Arteries only carry oxygenated blood. T / F
Capillaries have valves in them to stop the blood flowing backwards. T / F
Blood leaks out of capillaries so that the oxygen and glucose etc. can reach the cells. T / F
Blood flows along veins back to the heart because of gravity. T / F
22. Complete the following flow chart describing the pathway of blood through the circulatory system using the
following terms: Vena Cava, Left Atrium, Right Ventricle, Pulmonary Artery, Venules, Pulmonary Vein, Left
Ventricle, Arterioles, Right Atrium, Veins, Arteries
Vena Cava
Right
Atrium
____________
____________
____________
____________
Capillaries
Lungs
____________
____________
____________
____________
Aorta
____________