A nervous system can be defined as an organized group of cells, called neurons, specialized for the conduction of an impulse—an excited state—from a sensory receptor through a nerve network to an effector, the site at which the response occurs.
What is the nervous system simple definition?
The nervous system controls everything you do, including breathing, walking, thinking, and feeling. This system is made up of your brain, spinal cord, and all the nerves of your body. … The nerves carry the messages to and from the body, so the brain can interpret them and take action.
What is the simplest form of nervous system?
The nerve net is the simplest form of a nervous system found in multicellular organisms.
What are the 3 types of nervous system?
There are three types of nerves in your body: autonomic nerves, motor nerves, and sensory nerves. SOURCES: National Institute of Neurological Disorders and Stroke: “NINDS Peripheral Neuropathy Information Page.” Neuropathy Association: “About Peripheral Neuropathy: Facts.”
What are 3 things the nervous system does?
The nervous system has 3 main functions: sensory, integration, and motor.
- Sensory. The sensory function of the nervous system involves collecting information from sensory receptors that monitor the body’s internal and external conditions. …
- Integration. …
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What is nervous system explain with example?
The nervous system is made up of all the nerve cells in your body. … For example, if you touch a hot plate, you reflexively pull back your hand and your nerves simultaneously send pain signals to your brain. Metabolic processes are also controlled by the nervous system.
What is nervous system with diagram?
The Central Nervous System is the integration and command center of the body. It consists of the brain, spinal cord and the retinas of the eyes. The Peripheral Nervous System consists of sensory neurons, ganglia (clusters of neurons) and nerves that connect the central nervous system to arms, hands, legs and feet.
What makes CNS?
The central nervous system is made up of the brain and spinal cord. The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.
Which organisms do not have a nervous system?
The only multicellular animals that have no nervous system at all are sponges and microscopic bloblike organisms called placozoans and mesozoans. The nervous systems of ctenophores (comb jellies) and cnidarians (e.g., anemones, hydras, corals and jellyfishes) consist of a diffuse nerve net.
Do sponges have a nervous system?
Sponges are among the most primitive of all animals. They are immobile, and live by filtering detritus from the water. They have no brains or, for that matter, any neurons, organs or even tissues.
What is the main nerve in your body?
The sciatic nerve is the largest and longest spinal nerve in the human body.
What organs are in nervous system?
The nervous system in a human is made of the brain, spinal cord, sensory organs and all the neurons that serve as communication channels between the various organs of the body.
What is nervous system and its function?
The nervous system is involved in receiving information about the environment around us (sensation) and generating responses to that information (motor responses). The nervous system can be divided into regions that are responsible for sensation (sensory functions) and for the response (motor functions).
What diseases attack the nervous system?
- Parkinson’s disease.
- Multiple sclerosis (MS).
- Amyotrophic lateral sclerosis (ALS).
- Alzheimer’s disease.
- Huntington’s disease.
- Peripheral neuropathies.
What are the top 3 common nervous system disorders?
Brain and nervous system problems are common. These neurological disorders include multiple sclerosis, Alzheimer’s disease, Parkinson’s disease, epilepsy, and stroke, and can affect memory and ability to perform daily activities.
Why nervous system is important?
The nervous system helps all the parts of the body to communicate with each other. It also reacts to changes both outside and inside the body. The nervous system uses both electrical and chemical means to send and receive messages.