Grade 6 Biology Quiz

What is the main function of arteries in the human body?

• Help with digestion in the stomach

• Regulate body temperature

• Carry deoxygenated blood towards the heart

• Carry oxygenated blood away from the heart

Which blood vessels carry oxygenated blood away from the heart?

• Lymphatic vessels

• Arteries

• Capillaries

• Veins

What is the main organ of the circulatory system?

• Heart

• Stomach

• Brain

• Kidney

Where does the exchange of oxygen and nutrients take place in the body?

• In the stomach and the brain

• In the hair and nails

• In the lungs and the small intestine

• In the heart and liver

Which blood vessels have the thinnest walls and allow for the exchange of substances between the blood and tissues?

• Arteries

• Capillaries

• Veins

• Lungs