Topic 2: Lesson 4 (Circulatory System #1)

What is the main organ of the circulatory system?

• small intestine

• bone

• lungs

• heart

These blood vessels carry oxygenated blood away from the heart.

• Arteries

• Veins

• Capillaries

These blood vessels carry deoxygenated blood back to the heart.

• Arteries

• Veins

• Capillaries

______________ are the smallest blood vessels.

• Arteries
• Veins
• Capillaries

These blood vessels take oxygenated blood to the body cells.

• heart

• artery

• vein

• capillary

Small blood vessels that diffuse oxygen, carbon dioxide, and nutrients.

• heart

• arteries

• veins

• capillaries

The 3 main functions of the Circulatory System

• break down food, remove waste, make blood cells

• react to stimuli, grow, adapt

• deliver materials, remove waste, and fight infection

Which blood vessels send blood to the heart?

• Arteries

• Veins

• Capillaries

Which blood vessels have the thickest walls?

• Arteries

• Veins

• Capillaries

What are the main organs of the circulatory system?

• brain, spine, & nerves

• heart, arteries, & veins

• heart, lungs, & veins

• skin, nails, & hair