The Stretch Reflex : (See Figure 13.15). The stretch reflex in its simplest form involves only 2 neurons, and is therefore sometimes called a 2-neuron reflex. The two neurons are a sensory and a motor neuron. The sensory neuron is stimulated by stretch (extension) of a muscle.
Flash floods are the most common flood type in normally-dry channels in arid zones, known as arroyos in the southwest United States and many other names elsewhere. In that setting, the first flood water to arrive is depleted as it wets the sandy stream bed.
New map can track hurricane flooding from Florida to Maine. With about 22 million people vulnerable to dangerous hurricane storm surges, forecasters have long struggled over how to issue warnings, especially in low-lying Florida, where waters can rise far inland. Now they have an interactive map that tracks flooding not only by location, but storm strength.