Grade 3 · Science · Challenge
Free Human Body & Health worksheet - version 18
Grade 3 human body & health practice with original questions, explanations, and difficulty-matched printable versions. This printable version includes 8 grade-appropriate questions and a separate answer sheet.
Human Body & Health
Grade 3 · Stretch challenge · 8 questions · Version PG-790R2-WAAR
1.Which cells carry oxygen?
2.Why is a balanced diet useful?
3.Which system sends messages through nerves?
4.What maintains stable internal conditions?
5.What carries oxygen from lungs to cells?
6.What do kidneys remove from blood?
7.Why does heart rate rise during exercise?
8.How do lungs and circulation interact?
Answers and teaching notes
Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.
Show answers for version 18
- Which cells carry oxygen?Red blood cells
- Why is a balanced diet useful?It supplies varied nutrients
- Which system sends messages through nerves?The nervous system
- What maintains stable internal conditions?Homeostasis
- What carries oxygen from lungs to cells?The circulatory system
- What do kidneys remove from blood?Wastes and extra water
- Why does heart rate rise during exercise?Muscles need oxygen and nutrients faster
- How do lungs and circulation interact?Lungs add oxygen to blood, which carries it to cells
Worked example
Connect a structure to its function and explain how body systems work together.
Common mistake
Naming an organ without explaining its system role.
Helpful hint
Trace what enters, changes, and leaves the system.