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Organ Systems Vocabulary

Science · Organisms & Life Processes · ages 9-11

Name ______________________ Date ____________

Which system brings oxygen into your blood and removes carbon dioxide through the lungs?
- Skeletal system
- Respiratory system
- Muscular system
Which of these is an organ that pumps blood through your body?
- Heart
- Blood
- Oxygen
After oxygen enters blood in the lungs, the circulatory system carries it to body tissues.
Circle one: True False
Which of these organs uses digestive enzymes to help break down food?
- Stomach
- Heart
- Lungs
Blood leaves the heart through one vessel and later returns through another. Which pair names them in that order?
- Vein, then artery
- Capillary, then vein
- Artery, then vein
Which organs form the supporting framework that many muscles pull on to move your body?
- Lungs
- Bones
- Blood vessels
Nora writes, 'In an arm capillary, oxygen passes from nearby cells into blood.' Which change repairs her sentence?
- Oxygen passes from blood to nearby cells.
- Oxygen passes from air into blood in the arm.
- Oxygen stays in blood and never reaches cells.
Maya writes, 'My stomach belongs to the respiratory system because it takes oxygen from air.' Which sentence correctly names the systems and their jobs?
- The stomach digests food in the circulatory system; the lungs exchange gases in the respiratory system.
- The stomach digests food in the respiratory system; the lungs exchange gases in the respiratory system.
- The stomach digests food in the digestive system; the lungs exchange gases in the respiratory system.

Answer key

For grown-ups. Fold this page away before handing over the rest.

Respiratory system · The respiratory system exchanges gases in the lungs. Oxygen enters the blood, and carbon dioxide leaves it to be breathed out.
Heart · The heart is the organ that pumps blood. Blood carries substances such as oxygen through the vessels.
True · The respiratory system passes oxygen into blood in the lungs. The circulatory system carries that oxygen to body tissues.
Stomach · Digestive enzymes work in the stomach to help break down food. Most nutrient absorption happens in the small intestine.
Artery, then vein · Arteries carry blood away from the heart. Veins carry blood back toward the heart.
Bones · Bones form the skeletal system. Many muscles pull on bones to produce movement.
Oxygen passes from blood to nearby cells. · In body tissues such as the arm, oxygen passes from blood in capillaries to nearby cells. Oxygen enters blood from air in the lungs.
The stomach digests food in the digestive system; the lungs exchange gases in the respiratory system. · The stomach digests food in the digestive system. The lungs exchange gases in the respiratory system. Maya has assigned the stomach the lungs' job and system.