Diaphragm

Summary: When you breathe, muscles in your chest get shorter. They contract. This model can show you what is happening inside your lungs when you breathe in and out. The jar represents your chest. The balloons represent your lungs. The rubber sheet represents a muscle called the diaphragm. Tags: science student-book-7 biology Created: 2026-05-21 Last Updated: 2026-05-21

Diaphragm

When you breathe, muscles in your chest get shorter. They contract. This model can show you what is happening inside your lungs when you breathe in and out. The jar represents your chest. The balloons represent your lungs. The rubber sheet represents a muscle called the diaphragm.

Source

This concept is from the [Science Student Book 7](Science Student Book 7/Biology/Body Systems/2.5 Breathing - lungs.md), Biology section.