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1. Which organ takes in oxygen from the air?
Lungs
Stomach
Heart
Kidneys
2. The windpipe that carries air toward the lungs is called
Bronchi
Esophagus
Trachea
Capillary
3. The small air sacs where oxygen enters the blood are called
Cilia
Bronchi
Veins
Alveoli
4. What keeps the trachea from collapsing?
Bones
Cartilage rings
Muscles
Diaphragm
5. Which muscle moves down when you breathe in?
Rib muscles
Tongue
Diaphragm
Heart
6. Gas exchange happens in the
Diaphragm
Trachea
Alveoli
Bronchi
7. Oxygen moves into the blood by
Pumping
Diffusion
Filtration
Digestion
8. Which gas moves from the blood into the alveoli?
Carbon dioxide
Argon
Nitrogen
Oxygen
9. Which blood vessels surround the alveoli?
Arteries
Capillaries
Bronchioles
Veins
10. Exhaled air has more
Nitrogen
Hydrogen
Oxygen
Carbon dioxide
11. Which organ pumps blood around the body?
Heart
Brain
Lungs
Diaphragm
12. How many chambers are in the human heart?
2
3
5
4
13. The right side of the heart pumps blood to the
Body
Brain
Kidneys
Lungs
14. The left side of the heart pumps blood to the
Body
Nose
Stomach
Lungs
15. Which blood vessels carry blood away from the heart?
Veins
Bronchi
Capillaries
Arteries
16. Which blood vessels carry blood to the heart?
Veins
Capillaries
Trachea
Arteries
