![]() Groups of cells in the nerve net form nerve cords that may be essential for more rapid transmission. The function of the nerve cells is to carry signals from sensory cells and to contractile cells. The nervous system is primitive, with nerve cells scattered across the body in a network. However, organs and organ systems are not present in this phylum. There are differentiated cell types in each tissue layer, such as nerve cells, enzyme-secreting cells, and nutrient-absorbing cells, as well as intercellular connections between the cells. Between these two layers is a non-living, jelly-like mesoglea. an immature stage of an organism that looks different from the adult form. producing toxins that make them unpalatable or poisonous to potential predators. how do many sponges protect themselves from predators. The outer layer is called the epidermis, whereas the inner layer is called the gastrodermis and lines the digestive cavity. sponges rely on water movement to carry out body functions. ![]() ![]() All cnidarians have two tissue layers, with a jelly-like mesoglea between them.Īll cnidarians have two tissue layers. ![]() \): Cnidarians have two distinct body plans, the (a) medusa and the (b) polyp. ![]()
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