Grade 3 · Science · Challenge
Free Human Body & Health worksheet - version 16
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-1XKFGKC-WAAR
1.What is the immune system's job?
2.What do kidneys remove from blood?
3.Which cells carry oxygen?
4.How do lungs and circulation interact?
5.How do vaccines help?
6.What maintains stable internal conditions?
7.What carries oxygen from lungs to cells?
8.Why does heart rate rise during exercise?
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 16
- What is the immune system's job?Defend against harmful pathogens
- What do kidneys remove from blood?Wastes and extra water
- Which cells carry oxygen?Red blood cells
- How do lungs and circulation interact?Lungs add oxygen to blood, which carries it to cells
- How do vaccines help?They prepare immunity to recognize a pathogen
- What maintains stable internal conditions?Homeostasis
- What carries oxygen from lungs to cells?The circulatory system
- Why does heart rate rise during exercise?Muscles need oxygen and nutrients faster
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.