Circulatory System Quiz

The pigment that gives blood its red color is:

• Hemoglobin

• Chlorophyll

• Melanin

• Carotenoids

Compared to arteries, veins have:

• Thicker walls

• More muscle and elastic tissue

• No valves

• Thinner walls and valves

In tissue capillaries, oxygen and nutrients diffuse out to:

• Blood plasma

• Red blood cells

• Body cells

• White blood cells

The vein that carries oxygenated blood from the lungs to the heart is the:

• Pulmonary vein

• Anterior vena cava

• Posterior vena cava

• Hepatic vein

Arteries have thicker walls compared to veins in order to:

• Withstand higher blood pressure

• Increase blood flow

• Prevent backflow of blood

• Allow gas exchange

The straw-colored liquid component of human blood is called:

• Red blood cells

• White blood cells

• Platelets

• Blood plasma

The artery that supplies oxygenated blood to the liver is the:

• Hepatic artery

• Mesenteric artery

• Renal artery

• Iliac artery

The cell fragments involved in blood clotting are called:

• Red blood cells

• White blood cells

• Platelets

• Plasma cells

White blood cells defend the body against diseases by:

• Transporting oxygen

• Producing antibodies and engulfing foreign particles

• Forming blood clots

• Carrying nutrients

The largest artery in the human body is the:

• Aorta

• Carotid artery

• Pulmonary artery

• Renal artery