year6 Science test3

What is the main organ of the human circulatory system?

• Liver

• Heart

• Lungs

• Kidneys

Which blood vessels carry oxygenated blood away from the heart?

• Veins

• Arteries

• Capillaries

• Alveoli

What is the purpose of red blood cells in the circulatory system?

• Carry oxygen to the body cells

• Fight infections

• Produce hormones

• Remove waste products

What is the name of the large blood vessel that carries blood from the heart to the rest of the body?

• Aorta

• Pulmonary artery

• Vena cava

• Coronary artery

What is the liquid component of blood that helps in clotting?

• Plasma

• Platelets

• White blood cells

• Hemoglobin

Where does the exchange of oxygen and carbon dioxide take place in the circulatory system?

• Heart

• Lungs

• Liver

• Stomach

What is the purpose of valves in the heart?

• Regulate blood pressure

• Pump blood to the body

• Prevent backflow of blood

• Produce red blood cells

Which chamber of the heart pumps oxygenated blood to the rest of the body?

• Left atrium

• Right atrium

• Left ventricle

• Right ventricle

What is the function of the circulatory system in the body?

• Digestion of food

• Transportation of nutrients and gases

• Elimination of waste products

• Production of energy

What is the term for the circulation of blood from the heart to the lungs and back?

• Pulmonary circulation

• Systemic circulation

• Coronary circulation

• Lymphatic circulation