Human Body Systems

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What is the main organ of the Skeletal System?

What is the main organ of the Circulatory System?

The job of the circulatory system is to

How many bones are in the adult human body?

What is added to food when it enters the stomach?

What body part is the first step in digestion?

What blood vessel takes the blood away from the heart to the rest of the body?

Where does the food go after it is chewed?