Circulatory System and the Heart

What is the main organ of the circulatory system?

• small intestine

• bone

• lungs

• heart

The job of the heart is to . . .

• transport blood around the body.

• send food to the small intestines.

• break down food.

• give energy to the body.

What are the main organs of the circulatory system?

• Lungs, blood, blood vessels

• Liver, kidneys, and stomach

• Heart, Blood Vessels, and Blood

The circulatory system transports

• Oxygen, and carries away carbon dioxide

• Only oxygen

• Oxygen and nutrients to the entire body

• carbon dioxide and carries away oxygen

What do the arteries do?

• pump blood to the heart

• pumps blood to and from the heart
• carry blood away from the heart 

• a muscle 

The dividing wall between the right and left side of the heart.

• septum
• valve
• heart muscle
• blood

Match the following parts of the circulatory system

• valves

• a lower chamber of the heart

• ventricle

• Two large veins that enter the heart

• atrium

• the largest artery in the body

• venae cavae

• an upper chamber of the heart

• aorta

• little door like flaps

The Pulmonary Artery

d

5

3

2

6

LEFT ventricle

a

4

2

6

1

The Aorta

c

2

1

6

5