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