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1. What are the two basic types of blood vessels?
Arteries and veins
2. What is the main function of arteries?
To transport oxygen-rich blood from the heart to the cells of the body
3. What is the largest artery in the human body?
Aorta
4. Where does the aorta carry blood from and to?
rom the left ventricle to the stomach area
5. What are the smaller branches of the aorta called?
Arterioles
6. What is the primary function of capillaries?
To exchange molecules between the blood and body cells
7. How do the body's cells receive oxygen from the blood?
Through capillaries with thin walls
8. After delivering oxygen and food, where does blood flow from the capillaries?
Into the veins
9. What are the small veins that receive blood from capillaries called?
Venules
10. How does the pressure in veins compare to the pressure in arteries?
It is much lower
11. What helps move blood through the veins toward the heart?
Muscles surrounding the veins
12. What is the purpose of the tiny valves inside veins?
To prevent backflow and allow blood to flow only toward the heart
13. When blood returns to the heart, which chamber does it enter?
Right atrium
14. Approximately how many liters of blood pass through the heart in a single day?
4,000 liters
15. Why is the continuous circulation of blood essential to survival?
It maintains every cell of the body with oxygen and nutrients
