Human Blood Circulatory System

What part of blood is responsible for carrying oxygen and carbon dioxide to body cells?

• Red Blood Cells
• White Blood Cells
• Platelets
• Plasma

Oxygen-transporting protein in red blood cells that gives the cells their characteristic red color.

• thrombin
• hematocrit
• hemoglobin
• hemostasis

What part of blood is responsible for fighting infections?

• Red Blood Cells
• White Blood Cells
• Platelets
• Plasma

Which part of the heart pumps deoxygenated (oxygen-poor) blood?

• Left side
• Right side
• Top side
• Bottom side

What do the arteries do?

• pumps blood to the heart
• pumps blood to and from the heart
• carry's blood away from the heart 
• a muscle 

______________ are the smallest blood vessels.

• Arteries
• Veins
• Capillaries

Which chambers of the heart are the thickest and strongest?

• Atria
• Ventricles
• Valves
• Aorta

What is the main organ of the circulatory system?

• small intestine

• bone

• lungs

• heart

How many types of blood vessels are in our body?

• 1
• 2
• 3
• 4

The job of the heart is to . . .

• pump blood around the body.

• send food to the small intestines.

• break down food.

• give energy to the body.