kids encyclopedia robot

Atrium (heart) facts for kids

Kids Encyclopedia Facts
See also: Atrium (architecture) and Atrium, Cardiff
Quick facts for kids
Atrium
Diagram of the human heart (cropped).svg
Front view of heart showing the atria
Latin Atrium

The atrium (Latin ātrium, “entry hall”) is the upper chamber through which blood enters the ventricles of the heart. There are two atria in the human heart – the left atrium receives blood from the pulmonary (lung) circulation, and the right atrium receives blood from the venae cavae (venous circulation). The atria receive blood while relaxed (diastole), then contract (systole) to move blood to the ventricles. All animals with a closed circulatory system have at least one atrium. Humans have two atria.

Images for kids

  • Heart right anatomy

    Right heart anatomy

  • Heart left atrial appendage tee view

    left atrial appendage shown at upper right

  • Thrombus linkes Herzohr 92jw - CT axial und coronar - 001

    CT scan of the chest showing a thrombus in the left atrial appendage (left: axial plane, right: coronal plane)

See also

Kids robot.svg In Spanish: Aurícula (corazón) para niños

kids search engine
All content from Kiddle encyclopedia articles (including the article images and facts) can be freely used under Attribution-ShareAlike license, unless stated otherwise. Cite this article:
Atrium (heart) Facts for Kids. Kiddle Encyclopedia.