Grade 7 · Science

Grade 7 Science — Human body systems questions and answers

Circulatory, respiratory, and digestive systems. Written in American English for students, parents, and teachers in the United States.

Practice quiz

Open a card to see the answer. These are original practice items for US elementary students — not a state test copy.

1. The circulatory system moves

Answer: blood

The heart pumps blood through vessels.

2. The respiratory system’s main job is

Answer: gas exchange (oxygen and carbon dioxide)

Lungs bring in O₂ and release CO₂.

3. The digestive system

Answer: breaks food into nutrients

Mouth, stomach, intestines.

4. Arteries generally carry blood

Answer: away from the heart

Veins return blood toward the heart.

5. The brain is part of the

Answer: nervous system

It sends and receives signals.

6. Bones and muscles work together for

Answer: movement

Muscles pull on bones.

7. The organ that filters blood and makes urine is the

Answer: kidney

Kidneys are in the excretory system.

8. Which nutrient is the body’s usual quick energy source?

Answer: carbohydrates

Sugars and starches.