Why cnidarians have diffused nervous system?
Answer: Because pin the cnidarian body, the nerve net serves as a sensory locator neuron cell stretch all around the animals body and allow the cnidarian to detect chemical change ,to capture prey, and to move in response to stimulus.
What is the function of nervous tissue in a cnidarian?
This nervous system allows cnidarians to respond to physical contact. They can detect food and other chemicals in a rudimentary way. While the nerve net allows the organism to respond to its environment, it does not serve as a means by which the organism can detect the source of the stimulus.
What’s an unusual feature of the nervous system of cnidarians?
What is an unusual feature of the nervous system of cnidarians? Cnidarians have nerve nets. Many of the synapses have vesicles of neurotransmitters on both sides, allowing transmission across the synapse in either direction. Also, they do not have insulating material (myelin) on the axons.
Does Hydra have nervous system?
2.1 Hydra Has a Simple Nervous System. Hydra possesses one of the anatomically simplest nervous systems—a diffuse nerve net spread throughout the body with no signs of centralization (Figures 2 and 3A). It is made up of about 6.000 nerve cells belonging to two morphological types—sensory and ganglion neurons.
Do echinoderms have a nervous system?
The adult echinoderm nervous system is composed of a central nervous system made up of a nerve ring connected to a series of radial nerve cords.
What is a diffused nervous system?
The diffuse nervous system is the most primitive nervous system. In diffuse systems nerve cells are distributed throughout the organism, usually beneath the outer epidermal layer. … Diffuse systems are found in cnidarians (hydroids, jellyfish, sea anemones, corals) and in ctenophores, or comb jellies.
Do all organisms have a nervous system?
Nervous systems are found in almost all multicellular animals, but vary greatly in complexity. The only multicellular animals that have no nervous system at all are sponges and microscopic bloblike organisms called placozoans and mesozoans.
Do Cnidaria have nerves?
Cnidarians have simple nervous systems and it was probably within this group or a closely-related ancestor that nervous systems first evolved. … We propose that these multifunctional neurons resemble the ancestors of the more specialized neurons that we find in higher animals today.
What is the nervous system of porifera?
Sponges have no nervous system or organs like most animals do. This means they don’t have eyes, ears or the ability to physically feel anything. However, they do have specialized cells that carry out different functions within their bodies.
What type of nervous system do annelids have?
In general, the central nervous system (cns) of Annelida is composed of a ventral nerve cord and a prostomial brain. It consists of a central neuropil- (or fibre-) core surrounded by neuronal somata. Besides neurons, glial cells are present and may form a prominent layer around the neuropil and somata [2,3,4].