---
title: "Organ Systems Vocabulary"
description: "Use technical vocabulary for the major organ systems: organ, organ system, circulatory system, digestive system, respiratory system, skeletal system, muscular system, nutrient, oxygen, carbon dioxide,"
canonical: https://lightmysky.com/learn/science/organ-systems-vocabulary-mt_K8DJzqbksM
source: https://lightmysky.com/learn/science/organ-systems-vocabulary-mt_K8DJzqbksM.md
retrieved: 2026-11-12
---

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# Organ Systems Vocabulary

Use technical vocabulary for the major organ systems: organ, organ system, circulatory system, digestive system, respiratory system, skeletal system, muscular system, nutrient, oxygen, carbon dioxide, blood vessel, artery, vein, capillary, enzyme. Describe the function of each system using these terms.

Subject: Science · Area: Organisms & Life Processes · Ages 9 to 11
Page: https://lightmysky.com/learn/science/organ-systems-vocabulary-mt_K8DJzqbksM

## Ready when they can

- Name the main organs in at least two body systems and state their functions using the correct vocabulary
- Recognize correct written descriptions matching the circulatory, digestive and respiratory systems to their functions
- Explain the difference between an artery and a vein using the correct anatomical terms

## Lesson: Organ Systems Vocabulary

You have learned that tissues form organs. An organ contains different tissues working together. Organs working together form an organ system. Bones form the skeletal system, which supports your body. Muscles form the muscular system. Many muscles pull on bones to move you.

**Example.** The circulatory system includes the heart, blood and blood vessels. The heart pumps blood through the vessels. Blood carries oxygen and nutrients to body tissues and carries wastes away. Arteries carry blood away from the heart. Veins carry blood toward it. In tiny vessels called capillaries, materials pass between blood and nearby tissues. In body tissues, oxygen leaves blood and carbon dioxide enters it.

*(drawing: A shortened body route: heart, arteries, capillaries, veins, heart. In these capillaries, oxygen leaves blood and carbon dioxide enters it.)*

**Example.** The digestive system includes the mouth, stomach and intestines. Nutrients are substances in food that your body can use. Chewing breaks food into pieces. Digestive enzymes speed up the breakdown of some food molecules. These enzymes work in the stomach and small intestine. Most nutrient absorption happens in the small intestine, where many small nutrients pass through its wall into blood.

Oxygen is a gas your body needs. Carbon dioxide is a waste gas your cells make. In the lungs, oxygen passes from air into blood. Carbon dioxide passes from blood into air to be breathed out. The respiratory system handles this exchange. The circulatory system then carries oxygen to body tissues. The stomach digests food in the digestive system; the lungs exchange gases in the respiratory system.

**Recap.** Organs work together in organ systems such as the circulatory, digestive, respiratory, skeletal and muscular systems. Each has its own job and vocabulary.

*Original lesson, quiz and flashcard text written for this learning dataset.*

## Practice

8 questions on this page, each with its working shown.

## Needs first

- [Cells, Tissues & Organs](https://lightmysky.com/learn/science/cells-tissues-and-organs-mt_C7FNeIDGc6)

## Opens up

- [The circulatory system](https://lightmysky.com/learn/science/the-circulatory-system-mt_BX4D8cCFtQ)
- [Human Life Stages](https://lightmysky.com/learn/science/human-life-stages-mt_OSfCeIeBak)
- [Nutrient Transport in Animals](https://lightmysky.com/learn/science/nutrient-transport-in-animals-mt_YSyjTZfjvv)