Exploring the Circulatory System

What is the main function of the heart?

• To regulate body temperature

• The main function of the heart is to pump blood.

• To produce hormones for digestion

• To filter toxins from the blood

Name the blood vessels that carry blood away from the heart.

• Veins

• Capillaries

• Arteries

• Venules

What is the liquid part of the blood called?

• white blood cells

• serum

• plasma

• red blood cells

How does oxygen get from the lungs to the blood?

• Oxygen is converted into carbon dioxide before entering the blood.

• Oxygen is transported by red blood cells directly from the mouth.

• Oxygen is absorbed through the skin into the bloodstream.

• Oxygen gets from the lungs to the blood through diffusion in the alveoli.

What is the role of red blood cells in the body?

• Red blood cells are responsible for digestion.

• Red blood cells transport oxygen and carbon dioxide in the body.

• Red blood cells produce hormones in the body.

• Red blood cells help in the formation of bones.