The Human Body
Map
Arrows point from what you learn first to what it opens. Point at a concept to light up its chain and where it comes back deeper. Right-click a concept (or press and hold it) for its lessons and stories.
- Proven to depth123
- Open
- Locked
- Comes back deeper
Learning path
In the order the concepts build on each other.
- Organ systemsLockedGroups of organs that work together on one big job - digesting food, moving blood, breathing, sending messages. A human body has about eleven, and none of them can keep you alive on its own.Opens after: Levels of organisation
- CirculationLockedThe heart pumping the same blood round and round the body: out through arteries, through tiny capillaries where oxygen and food reach the cells, and back through veins - in two loops, one to the lungs and one to the body.Opens after: Organ systems
- DigestionLockedBreaking food down - by chewing and churning, and with enzymes - into pieces small enough to pass through the wall of the small intestine into the blood.Opens after: Organ systems, Enzymes
- Nervous systemLockedThe brain, spinal cord and nerves: the body's message network, which senses, decides and sends orders. Its cells, neurons, carry electrical signals, and for some dangers the spinal cord answers on its own, in a reflex.Opens after: Organ systems
- BreathingLockedMoving air in and out of the lungs, so that in hundreds of millions of tiny air sacs oxygen passes into the blood and carbon dioxide passes out. It is not the same as respiration, which is what cells do with the oxygen.Opens after: Circulation
Connections to other domains
- Digestion needs EnzymesEnergy for Life
- Organ systems needs Levels of organisationThe Cell