The Circulatory System

What is the main function of the circulatory system?

• To produce energy

• To transport blood, nutrients, oxygen, and waste products

• To help the body digest food

• To control movement and balance

Which of the following is NOT a component of the circulatory system?

• Heart

• Blood vessels

• Blood

• Lungs

What is the primary organ that pumps blood throughout the body?

• Lungs

• Stomach

• Heart

• Kidneys

What do the blood vessels in the circulatory system carry to the body’s cells?

• Water and vitamins

• Nutrients, oxygen, and waste products

• Hormones and enzymes only

• White blood cells only

Which type of blood vessel carries blood away from the heart?

• Veins

• Arteries

• Capillaries

• Lymph vessels

The circulatory system helps to remove which of the following from the body?

• Nutrients

• Carbon dioxide

• Oxygen

• Hormones

What is the main component of blood that carries oxygen to the body’s cells?

• Red blood cells

• White blood cells

• Platelets

• Plasma

The network of tiny blood vessels that connect arteries and veins is called what?

• Valves

• Capillaries

• Arterioles

• Villi

What role do veins play in the circulatory system?

• They carry oxygen-rich blood from the lungs to the heart

• They transport blood from the heart to the body

• They bring deoxygenated blood back to the heart

• They produce white blood cells

Which part of the circulatory system is responsible for pumping oxygenated blood to the rest of the body?

• Right atrium

• Left ventricle

• Right ventricle

• Left atrium