The rib cage (for class 6 level) is the bony framework in your chest made of ribs, the breastbone, and part of the backbone; it protects the heart and lungs and helps in breathing.

Simple definition (Class 6 level)

  • The rib cage is the set of curved bones in your chest that look like a basket around your heart and lungs.
  • It is also called the thoracic cage.
  • It gives shape to your chest and helps you breathe in and out by moving slightly up and out, then down and in.

Parts of the rib cage

  • 12 pairs of ribs (so 24 ribs in total in most people).
  • The sternum (breastbone) in the front, where many ribs attach.
  • The thoracic vertebrae (part of the backbone) at the back, where all ribs are attached.

Types of ribs (names you might see)

  • True ribs (1–7): Attach directly to the sternum using cartilage.
  • False ribs (8–12): Do not attach directly to the sternum; 8–10 join the cartilage of the rib above.
  • Floating ribs (11–12): Do not attach to the sternum at all; they end in the muscles of the body wall.

Functions (why it is important)

  • Protects heart and lungs like a hard shield around them.
  • Helps in breathing by moving slightly so your lungs can expand.
  • Supports muscles of the chest, back, and upper body so you can move, twist, and lift.

One small story-style example

Imagine your heart and lungs are like a very delicate machine placed inside a hard, curved helmet.
The helmet is the rib cage : if you fall or bump your chest, the ribs take most of the hit so the “machine” inside stays safe, and when you breathe, the helmet gently opens a bit to let more air in.

TL;DR: For class 6, you can write:

“The rib cage is the bony framework in the chest made of 12 pairs of ribs, the sternum, and part of the backbone. It protects the heart and lungs and helps in breathing.”

Information gathered from public forums or data available on the internet and portrayed here.