Learn about the structure, function, and composition of the human body, the physical substance of the human organism. Explore the tissues, organs, systems, and biochemical constituents of the body, as well as its growth, aging, and evolution.

Learn about the 12 major anatomy systems of the human body with detailed 3D illustrations. Explore the skeletal, muscular, cardiovascular, digestive, endocrine, nervous, respiratory, immune, urinary, reproductive, and integumentary systems.

Learn about the vital and non-vital organs of the body, their functions, and the organ systems they belong to. See an interactive body map and diagram of the organs and their locations.

The human body is a biological machine made of body systems; groups of organs that work together to produce and sustain life. Sometimes we get lost while studying about cells and molecules and can’t see the forest for the trees.

How does the human body work? What roles do the digestive, reproductive, and other systems play? Learn about human anatomy and the complex processes that help your body function. Subscribe:...

The human body is a complex network of systems that work together to keep life-sustaining processes running smoothly. These systems break down food for fuel, clear away...

Anatomy is the science that studies the structure of the body. On this page, you'll find links to descriptions and pictures of the human body's parts and organ systems from head to toe.

Learn about the structure and function of the human body, from cells to organ systems, and how it changes over time. Explore anatomy, physiology, and molecular biology with videos, quizzes, and articles.

Explore the structure and functions of the human body systems, such as muscle, skeletal, respiratory, circulatory, nervous, renal, digestive, and more. Learn from Britannica articles and videos, and zoom in on different areas of the body with the interactive diagram.