The cell's interior is structured in a way that streamlines cell function.
See the parts of a cell in action.
Small compartments called vesicles carry materials throughout the cell.
Membranes are critical for organized and efficient cell function.
In 1665, Robert Hooke coined the term cell to describe the structures he could see in cork with some of the first microscopes. Since then, technology has given us an increasingly complex view of the basic unit of life.
How big are cells compared with other objects, molecules, and atoms?
The endosymbiotic theory explains how relatives of ancient bacteria ended up in modern-day cells.
Explore links to real cell videos and images.
Cells communicate through signals, aided by pathways made mostly of proteins. A cell's response depends on the signal itself, as well as the cell type.
When the brain detects danger or a threat, cell signaling machinery springs into action, producing a variety of responses throughout the body.
Take an in-depth look at one axis of cell communication during the fight or flight response.
Cell signals travel through the body, coming in contact with many cell types. The response depends on the type of cell the signal reaches.
Cell communication can be disrupted in a number of ways, sometimes resulting in disease.
See how signals travel into and through cells.