What is the main organ of the circulatory system?

• small intestine

• bone

• lungs

• heart

Veins carry oxygen poor blood ____________ the heart.

• towards

• away from

The job of the heart is to _____________.

• pumb blood around the body

• send food to the small intestine

• break down food

• give energy to the body

How many types of blood vessels are in our body?

• 1

• 2

• 3

• 4

____________ are the smallest blood vessels.

• arteries

• veins

• capillaries

The circulatory system works with the _____________ system to provide our body with oxygen and remove carbon dioxide.

• respiratory

• digestive

• muscular

• skeletal

The circulatory system works with the _____________ system to obtain energy from nutrients that we eat and deliver it to cells.

• respiratory

• digestive

• skeletal

• nervous

Arteries carry oxygen rich blood _____________ the heart

• toward

• away from

Which is the correct definition of the circulatory system?

• The system fights disease so the body stays healthy

• The system that circulates blood and oxygen through the body, consisting of the heart, blood and blood vessels

• Breaks down food into smaller pieces and absorbs those nutrients into the body

• provides shape and structure for the body

The heart has ________ chambers

• 1

• 2

• 3

• 4