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What is the main organ of the circulatory system?
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.
The heart is about the size and shape of your . . .
Arteries carry oxygen rich blood away from the heart.
Veins carry oxygen poor blood back to the heart.
Carry blood away from heart; mostly oxygen-rich
Which is NOT a function of the circulatory system?
deliver O2 and nutrients to cells
remove CO2 and wastes from cells
break down carbohydrates into glucose
transport other materials through body
The cells in the blood that help fight germs and illnesses are the...
red blood cells
white blood cells
Which best describes the relationship between the muscular system and the circulatory system?
The circulatory system captures carbon dioxide from the air for muscle energy.
The circulatory system produces red blood cells to bring oxygen to the muscles
The circulatory system provides a framework for muscle movement
The circulatory system delivers oxygen for muscle energy