![]() A coral can recognize specific pathogens and allografts. The immune system of a coral is a bit more complex than the other two species mentioned above. When it tips too far to one side, the statocyst stimulates the nerves and causes the muscles to contract, making the jellyfish turn right side up. Inside the rhopalia, there are these things called statocysts that help the jellyfish keep its balance. They form a row of small round structures along the rim of the bell of a jellyfish. Jellyfish do, however, have sensory organs called rhopalia. Also it has very little protein and even fewer minerals. As many know, it has no heart and is made up of mostly water (about 95%). Not much is known about the endocrine system of a jellyfish. This action comes in handy when the jellyfish is going to consume another species. Finally, the jellyfish then releases a toxin that can either paralyze or kill another predator. This reaction then spreads to the rest of the same tentacle making contact with the other object. When it is attacked, stinging threads uncoil quickly from its tentacles when it makes contact with another object. The immune system of a jellyfish is really just based on defending itself from other predators. Another thing is that thyroxine causes asexual reproduction through budding. Also, other stimuli can cause the releas of chemial substances that serve as signals for managing food behavior in the endocrine system. This happens because there is a long distance between the effector and target cell. The endocrine system of a hydra is also not so hard to comprehend. In evolution, the epithelium was an ancient system of host defence. Also, Toll-like receptors (TLRs) are not in the hydra. It also includes a TIR-domain containing protein not having leucine-rich repeats (LRRs). The induction of antimicrobial peptide production is controlled by the interaction of a leucine-rich repeats domain containing protein. A hydra's epithelium is well prepared with potent antimicrobial peptides. It does not have a protective barrier or a mobile phagocyte. A hydra is a multicellular animal with probably the most simple immune system.
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