5/3-5/12 Science Review

Which of the following is a harmful waste material that leaves the blood and travels through the lungs before leaving the body?

• CO₂ (carbon dioxide)
• O₂ (oxygen)
• H₂O (water)
• NaCl

Where does oxygen-rich blood go after leaving the lungs?

• The brain
• They heart
• The kidney
• The stomach

What is the main organ of the circulatory system?

• small intestine
• bone
• lungs
• heart

What is the main function of the respiratory system?

• to provide oxygen and remove carbon dioxide from the body
• to bring oxygen to the body
• to break down food and absorb nutrients
• to remove oxygen from the body and deliver carbon dioxide

All living things are made of...

• stuff.
• cells.
• skin.
• stardust.

What does the mouth do?

• Break down the food to make it easier to swallow
• Slows down jaws
• Nothing
• Neither

Why is the esophagus/food pipe important?

• To swallow food
• To choke
• To make your breath smelly
• None of these

What does the stomach do?

• Nothing
• Adds digestive juices/acids to the food
• Goes out to the rectum
• Barley any of these

What happens when the food goes to the small intestine?

• nutrients gets into the blood
• the food keeps on going
• nothing
• it connects to your lungs

What is the function of the digestive system?

• break down food into nutrients and gets rid of waste
• takes in oxygen and releases carbon dioxide
• sends messages to your body
• provides a structure and support for your body