![]() ![]() Food availability and quality also affect behavior in other ways. Given a choice, worms are capable of identifying and seeking out higher-quality food. Some types of bacteria are better at supporting growth than others. ![]() ![]() Isthmus peristalsis, a posterior moving wave of contraction of the muscle of the posterior isthmus, depends on a third motor neuron type.įeeding motions are regulated by the presence and quality of food in the worm's environment. Pharyngeal muscle is capable of pumping without nervous system input, but during normal rapid feeding its timing is controlled by two pharyngeal motor neuron types. Pumping, the most visible and best understood of the two, is a cycle of contraction and relaxation that sucks in liquid from the surrounding environment along with suspended particles, then expels the liquid, trapping the particles. It accomplishes this through a combination of two motions, pumping and isthmus peristalsis. The pharyngeal muscle captures food-bacteria-and transports it back to the intestine. elegans feeding depends on the action of the pharynx, a neuromuscular pump that joins the mouth to the intestine. ![]()
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