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KnovaKNOVA — A free reading app with curriculum-aligned passages on History & Science for Grades 3-8

What Are Muscles — Reading Comprehension

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Grades
  • 3
  • 4
  • 5
Standards
  • NGSS 4-LS1-1
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About This Reader

This engaging 250-word reading passage introduces fourth-grade students to the essential concept of muscles and how they create body movement. Aligned with NGSS 4-LS1-1 and the Disciplinary Core Idea LS1.A, the passage explains that muscles are body parts attached to bones that work by contracting (getting shorter) and relaxing (getting longer) to pull bones and create movement. Students learn that the human body contains hundreds of muscles and can explore this concept by feeling their own bicep muscle while bending their arm. The passage uses simple, grade-appropriate language and includes bolded key vocabulary terms with immediate definitions. A relatable hands-on example helps students connect the science concept to their own bodies. The passage includes audio integration to support diverse learners and is accompanied by a simplified differentiated version for students reading below grade level. Both English and Spanish translations are provided. Supporting activities include multiple-choice comprehension questions, writing prompts, and graphic organizers that reinforce understanding of muscle structure and function. This foundational lesson prepares students for deeper exploration of body systems and how structures support specific functions in living organisms.

Perfect For:

👩‍🏫 Teachers
  • • Reading comprehension practice
  • • Auto-graded assessments
  • • Literacy skill development
👨‍👩‍👧‍👦 Parents
  • • Reading practice at home
  • • Comprehension improvement
  • • Educational reading time
🏠 Homeschoolers
  • • Reading curriculum support
  • • Independent reading practice
  • • Progress monitoring

Reading Features:

📖
Reading Passage
Engaging fiction or nonfiction text
Comprehension Quiz
Auto-graded questions
📊
Instant Feedback
Immediate results and scoring
📄
Printable Version
Download for offline reading
🔊
Read Aloud
Voice-over with word highlighting

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