Circulatory system and heart

The circulatory system consists of ------ major components.

• two

• four

• six

• eight

The circulatory system is made up of --------.

Blood vessel carry blood away from and toward the heart.

• true

• false

• I don't know

The circulatory system carry waste product like carbon dioxide to the heart.

• true

• false

• I don't know

• ask the doctor

------ carry blood away from the heart.

------ carry blood back to the heart.

The circulatory system carry --------, --------, --------.

• carbon dioxide

• oxygen

• hormone

• nutrients

The heart is about the size of the three adults hands held together.

• true

• false

• I am a robot

• my heart is broken

• - - - - - is the most important thing to keep the circulatory system working at all times.

There are - - - - layers of the heart wall.

• one

• two

• three

• four