Where does digestion begin?

What organ stores food and mixes it with digestive juices?

Which part of the digestive system absorbs most nutrients?

Which organ produces bile to help digest fats?

What is the long tube that connects the mouth to the stomach?

What is the main function of the large intestine?

Which of these helps break down food in the mouth?

Which organ is NOT part of the digestive system?

What is the main organ of the circulatory system?

What does the heart do?

What are blood vessels that carry blood away from the heart?

Which blood vessels bring blood back to the heart?

What does blood carry to the rest of the body?

Which part of the blood fights infections?

Which part of the circulatory system is the smallest blood vessel?

What gives blood its red color?

What is the main function of the respiratory system?

Which organ is used for breathing?

What do we take in when we breathe?

What do we breathe out?

What part of the respiratory system is also called the windpipe?

What muscle helps the lungs expand and contract when we breathe?

What are the tiny air sacs in the lungs called?

What protects the lungs inside the chest?