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1.What are the upper chambers of the heart called?

• A. Ventricles

• B. Atria

• C. Valves

• D. Veins

What is the smallest kind of blood vessel in the body?

• A. Capillary

• B. Artery

• C. Vein

• D. Right ventricle

3. Which upper chamber of the heart receives blood from the body that is high in carbon dioxide and low in oxygen?

• A.Left atrium

• B. Right atrium

• C. Left ventricle

• D.Right ventricle

4. Blood in the left atrium is:

• A. High in carbon dioxide and low in oxygen

• B. High in oxygen and low in carbon dioxide

• C. High in both oxygen and carbon dioxide

• D. Low in both oxygen and carbon dioxide

5. What is the primary function of the ventricles in the heart?

• A. Receive blood from the lungs

• B. Pump blood to the body

• C. Store blood

• D. Regulate blood pressure

6. What is the role of the aortic valve in the heart?

• A. It controls the flow of blood between the left atrium and left ventricle

• B. It controls the flow of blood between the right ventricle and the pulmonary artery

• C. It controls the flow of blood between the left ventricle and the aorta

• D. It controls the flow of blood between the right atrium and right ventricle

7. What is the function of heart valves in the circulatory

system

• A. To regulate body temperature

• B. To prevent blood from flowing backward

• C. To produce red blood cells

• D. To remove waste products from the blood

8. How does oxygen-poor blood travel through the heart before reaching the lungs?

• A. Right atrium → Right ventricle → Pulmonary valve → Lungs

• B. Left atrium → Left ventricle → Aortic valve → Lungs

• C. Right atrium → Right ventricle → Mitral valve → Lungs

• D. Left atrium → Left ventricle → Pulmonary valve → Lungs

9. What is the primary function of capillaries in the circulatory system?

• A. To pump blood to the heart

• B. To carry oxygen-rich blood

• C. To bridge the gap between arteries and veins

• D. To store excess blood

10. Which part of the circulatory system allows the exchange of oxygen, nutrients, and waste products between the blood and body tissues?

• A. Veins

• B. Arteries

• B. Capillaries

• D. Heart valves