Sorry, you need to enable JavaScript to visit this website.
Skip to main content


Knows that multicellular animals have nervous systems to generate behavior; nervous systems are formed from specialized cells that conduct signals rapidly through the long cell extensions that make up nerves, and the nerve cells communicate with each other by secreting specific excitatory and inhibitory molecules.

Now You See It, Now You Don't

A demonstration of the effect of the optic disc, or "blind spot," inherent to the optic nerve entering the posterior of the eye (bulbus oculi).

View the full Example