Animals
Nerve nets can provide animals with the ability to sense objects through the use of the sensory neurons within the nerve net. The nerve net is the simplest form of a nervous system found in multicellular organisms. Unlike central nervous systems where neurons are typically grouped together, neurons found in nerve nets are found spread apart. Hydra, which are cnidarians, have a nerve net throughout their body. On the other hand, sea stars, which are echinoderms, have a nerve net in each arm, connected by a central radial nerve ring at the center. Dr. William E. Skaggs, Scholarpedia. The nervous system is the part of an animal's body that coordinates its behavior and transmits signals between different body areas. In vertebrates it consists of two main parts, called the central nervous system (CNS) and the peripheral nervous system (PNS). At the cellular level, the nervous system is defined by the presence of a special type of cell, called the neuron, also known as a nerve cell. Neurons have special properties that allow them to send signals rapidly and precisely to other cells. I'm not 100% sure, but i believe its considered the most complex because the nervous system includes over 1,000 tiny nerves running all throughout your body, sending and recei … ving signals from the brain, a constant course of electric activity. Just my guess. Without its control, the rest of the body would not be able to perform its everyday functions, and would certainly be unable to respond to emergencies. Consider that the body is a company, and the nervous system is the CEO. While other parts of it may be important to its success, they have no job without the boss. While organisms with bilateral body symmetry are normally associated with a central nervous system, organisms with radial symmetry are associated with nerve nets. Nerve nets can be found in members of the Cnidaria, Ctenophora, and Echinodermata phyla, all of which are found in marine environments. Hydra, which are cnidarians, have a nerve net throughout their body. On the other hand, sea stars, which are echinoderms, have a nerve net in each arm, connected by a central radial nerve ring at the center. The majority of animals on our planet, about 95 percent, do not possess a true backbone and are called invertebrates. It's common knowledge that vertebrates like humans have a complex nervous system that reacts to stimuli, but much less is known about invertebrates like shrimp and insects. The brain is a complex organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. It contains billions of nerve cells that are connected by synapses to other cells and can send a train of signal pulses throughout the body. Monera=No Protista=No Fungi=No Plantea=No Animalia=Yes. 3 people found this useful. Edit. Share to: 1  The Five Major Parts of the Brain At its most basic, the brain controls the body. 2  Electrical impulses are sent along the nervous system to and from the brain that regulate all movement. It is considered as the complex system of the body because it has 2 big divisions the peripheral and the central nervous system the central nervous system takes charge of the complex brain functions, such as intelligence,memory,behavior and feelings.that is why. 14 I'm not 100% sure, but i believe its considered the most complex because the nervous system includes over 1,000 tiny nerves running all throughout your body, sending and recei … ving signals from the brain, a constant course of electric activity. Just my guess. It is considered as the complex system of the body because it has 2 big divisions the peripheral and the central nervous system the central nervous system takes charge of the complex brain functions, such as intelligence,memory,behavior and feelings.that is why. 14 people found this useful. In this species, the nervous system is sexually dimorphic; the nervous systems of the two sexes, males and hermaphrodites, have different numbers of neurons and groups of neurons that perform sex-specific functions. In C. elegans, males have exactly 383 neurons, while hermaphrodites have exactly 302 neurons. The evolution of nervous systems dates back to the first development of nervous systems in animals (or metazoans).
https://en.wikipedia.org/wiki/Nerve_net http://www.scholarpedia.org/article/Nervous_system http://www.answers.com/Q/What_kingdom_most_posses_a_nervous_system https://en.wikipedia.org/wiki/Nerve_net http://education.seattlepi.com/shrimp-nervous-system-4658.html http://www.answers.com/Q/Which_kingdom_most_possess_a_nervous_system http://www.answers.com/Q/Which_kingdom_most_possess_a_nervous_system https://en.wikipedia.org/wiki/Evolution_of_nervous_systems
what kingdom possess a nervous system