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Cells Tissues Organs — Reading Comprehension

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NGSS 4-LS1-1

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This engaging 250-word reading passage helps Grade 4 students understand how the human body is organized from its smallest parts to complex systems. Aligned with NGSS 4-LS1-1 and DCI LS1.A, the passage uses a building analogy to explain how cells are like bricks that form tissues (walls), which combine to create organs (rooms), and how organs work together in body systems (buildings). Students explore real-world examples including muscle tissue, the heart, and the digestive system. The passage includes audio integration for accessibility, bold vocabulary terms with immediate definitions, and an interesting fact about cell numbers in the human body. Supplementary activities include multiple-choice comprehension questions testing recall and application, writing prompts requiring explanations and connections, and graphic organizers for comparing structures and understanding sequences. The content is specifically designed for fourth-grade reading levels with simplified differentiated versions and complete Spanish translations available. This resource builds foundational understanding of biological organization without overwhelming students with microscopic details, preparing them for hands-on investigations and deeper discussions about how living things are structured.

CONTENT PREVIEW

Diagram showing muscle cell to tissue, organ, and full body system. — Hierarchical levels of biological organization from individual cells to complex body systems.

Your body is made of tiny building blocks called cells. A cell is the smallest living part of your body. You cannot see cells without a microscope because they are so small. Every part of your body—your skin, bones, blood, and brain—is made of cells. Understanding how cells work together helps us know how our bodies stay healthy and grow.

Cells that do the same job group together to form tissue. Tissue is a group of similar cells working as a team. For example, muscle tissue is made of many muscle cells joined together. When these muscle cells work together, they help you move your arms and legs. Your body has different types of tissue, including skin tissue that covers your body and protects you.

Different tissues work together to form an organ. An organ is a body part that does a special job. Your heart is an organ made of muscle tissue and other tissues. The heart's job is to pump blood through your body. Your lungs are organs that help you breathe. Your stomach is an organ that breaks down food.

Organs that work together form a body system. A body system is a group of organs working together to do an important job. The digestive system includes your mouth, stomach, and intestines working together to break down food and give your body energy. Think of it this way: cells are like bricks, tissues are like walls, organs are like rooms, and a body system is like a whole building.

Interesting Fact: Your body contains about 37 trillion cells! If you could count one cell every second, it would take you over one million years to count them all.

What is the smallest living part of your body?

TissueCellOrganBody system

What is tissue made of?

Different organs working togetherSimilar cells working togetherDifferent body systemsBones and muscles only

What job does the heart do?

Helps you breatheBreaks down foodPumps blood through your bodyProtects your skin

Why do organs work together in systems?

To do important jobs for bodyTo make more cellsTo create new tissuesTo replace old organs

What happens when muscle cells work together?

They help you thinkThey help you moveThey help you digest foodThey help you see

Which example shows organs working as a system?

Muscle cells joining togetherSkin tissue covering your bodyMouth, stomach, intestines breaking down foodHeart made of muscle tissue