Video explanation
The top, lens and back separate to expose viewing, winding and film areas; the camera rotates and reassembles.
Lens and image plane
The lens focuses light onto the film plane. The exploded view makes their relative positions visible.
Exposure control
Aperture controls light throughput and shutter duration controls exposure time, together with film sensitivity.
Viewing and film transport
Viewing structures and film transport serve different roles. The animation emphasizes assembly rather than verified parts of a particular camera.