The trachea branches into two tubes known as the

What is the sheet of muscle below the lungs that aids in breathing?

Which of the following represents the function of the respiratory system?

Which two body systems work closely together to pump oxygenated blood through the body?

What is the function of the heart?

Where does the exchange of food, oxygen and waste occur?

Which type of blood vessels carry blood away from the heart to the body?

As your heart rate increases, the amount of carbon dioxide you exhale -

In the human digestive system most nutrients are absorbed into the blood through the lining of the

Which of the following systems must work together to bring oxygen to a muscle?

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