Cnidarians are the simplest multicellular animals that feel full after eating. When hydra makes a decision, they close their mouth and catch the prey. At the end of the feeding, the body column and tentacles increase.
The behavior associated with feeling is not triggered by gut distention. Thus, it shows that the chemical perception of predatory substances moisturizes the feeling of satiety.
Hydra’s eating habits are well documented. It is composed of a series of patterns of continuous behavior: mouth opening, catching prey, swallowing, regurgitation, and digesting. Stimuli (both chemical and mechanical) produced by floating prey cause the hydra to secrete nematocysts.
After invading the prey, the hydra’s tentacles convulse and the hydra opens its mouth by reduced glutathione (GSH) escaping from the prey. Writhing tentacles open to transport prey into the hydra’s mouth and swallow it. After consumption, the endoderm cells covering the intestinal hydra absorb food and return undigested material.
When the hydra eats enough, the tentacled nematocysts do not run away but begin to catch their prey. It is found in some studies that a water-soluble fraction (FR1) isolated by the method of size exclusion chromatography from a prey sample causes the inhibition of food uptake when incorporated into a solution surrounding the hydra. It is hypothesized that it binds to a putative receptor present in ectoderm receptor.
In research, it is shown that FR1 shortens the time of opening of the mouth in the presence of GSH, inhibits the binding of GSH to putative receptors, and induces contractions of the body, which are similar to those seen during the post-feeding behavior.
It is also found that an unbroken homogenate triggers intense contraction of tentacles for some time that is behaviorally different from the effects of GSH or FR1.
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