The human heart has four chambers.

Quick Scoop: Heart Chambers

  • 2 upper chambers called atria : right atrium and left atrium.
  • 2 lower chambers called ventricles : right ventricle and left ventricle.
  • The right side (right atrium + right ventricle) handles oxygen-poor blood going to the lungs.
  • The left side (left atrium + left ventricle) handles oxygen-rich blood going out to the body.

Mini breakdown

  • Atria: thinner-walled “receiving” chambers that collect blood coming into the heart.
  • Ventricles: thicker, muscular “pumping” chambers that push blood to the lungs and the rest of the body.

Simple example

You can think of the heart like a two-story, two-room pump:

  • Top floor rooms (atria) receive the blood,
  • Bottom floor rooms (ventricles) do the heavy pumping work.

TL;DR: The heart has four chambers—two atria and two ventricles—that work together to keep blood moving through your lungs and body.

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