Grade 3 · Science · Challenge
Free Human Body & Health worksheet - version 17
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-1XUF29B-WAAR
1.How do vaccines help?
2.What carries oxygen from lungs to cells?
3.What is the immune system's job?
4.How do lungs and circulation interact?
5.Why does heart rate rise during exercise?
6.Which cells carry oxygen?
7.Which system sends messages through nerves?
8.What maintains stable internal conditions?
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 17
- How do vaccines help?They prepare immunity to recognize a pathogen
- What carries oxygen from lungs to cells?The circulatory system
- What is the immune system's job?Defend against harmful pathogens
- How do lungs and circulation interact?Lungs add oxygen to blood, which carries it to cells
- Why does heart rate rise during exercise?Muscles need oxygen and nutrients faster
- Which cells carry oxygen?Red blood cells
- Which system sends messages through nerves?The nervous system
- What maintains stable internal conditions?Homeostasis
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.