irritability

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Orange basketball on black background and with low key lighting. Homepage 2010, arts and entertainment, history and society

The 10 Greatest Basketball Players of All Time

Close-up of crocodile eye; location unknown (rainforest, reptile).

What’s the Difference Between Alligators and Crocodiles?

A mug shot taken by the regional Colombia control agency in Medellin

Pablo Escobar: 8 Interesting Facts About the King of Cocaine

Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)

All 119 References in “We Didn’t Start the Fire,” Explained

Town of Sisimiut located on the coast of the Davis Strait on Kangerluarsunnguaq Bay, Greenland

The Largest Islands in the World

Ice Sledge Hockey, Hockey Canada Cup, USA (left) vs Canada, 2009. UBC Thunderbird Arena, Vancouver, BC, competition site for Olympic ice hockey and Paralympic ice sledge hockey. Vancouver 2010 Olympic and Paralympic Winter Games, Vancouver Olympics

10 Best Hockey Players of All Time

The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

irritability

physiology

Also known as: excitation

Learn about this topic in these articles:

nerves and nervous systems

In nervous system: Stimulus-response coordination
…of the cell fluid called irritability. In simple organisms, such as algae, protozoans, and fungi, a response in which the organism moves toward or away from the stimulus is called taxis. In larger and more complicated organisms—those in which response involves the synchronization and integration of events in different parts…
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