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