Homeostasis and Response


What is the Central Nervous System (CNS)?

2 years ago


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Cynthia Beatty

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Annabel W Profile Picture
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consists of the brain and the spinal cord and coordinates responses for the rest of the body, for example telling you to move a muscle

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The Central Nervous System is made up of the brain and the spinal chord (which are also known as coordinators). The Central Nervous System receives impulses from the sense organs and passes these impulses to other parts of the body containing effectors. This brings about a response.

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The CNS or the Central Nervous System is made of the Brain spinal cord and menenges.

The nervous system has two major parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The central system is the primary command center for the body, and is comprised of the brain and spinal cord. The peripheral nervous system consists of a network of nerves that connects the rest of the body to the CNS.

The two systems work together to collect information from inside the body and from the environment outside it. The systems process the collected information and then dispatch instructions to the rest of the body, facilitating an appropriate response.

In most cases, the brain is the final destination point for information gathered by the rest of the nervous system. Once data arrives, the brain sorts and files it before sending out any necessary commands.

The brain is divided into many different sections, including the cerebrum and brain stem. These parts handle pieces of the brain’s overall workload, including storing and retrieving memory and making body movements smooth.

Although the brain is the control center, its job would not be possible without the spinal cord, which is the major conduit for information traveling between brain and body.

Peripheral system nerves branch from either the brain stem or the spinal cord. Each nerve is connected to a particular area of the torso or limbs and is responsible for communication to and from those regions.

The PNS can also be subdivided into smaller components: the somatic and autonomic systems. The somatic involves parts of the body a person can command at will, and the autonomic helps run involuntary functions such as pumping blood.

Information conveyed through the nervous system moves along networks of cells called neurons. These neurons can only send information one way. Those transmitting to the brain are sensory neurons; those that transmit from the brain are known as motor neurons.

The nervous system can suffer from a number of afflictions, including cancer (e.g., brain tumors). Other problems include multiple sclerosis, in which damaged nerves prevent signals from traveling along them, and meningitis, which causes an inflammation of the membranes surrounding the brain and spinal cord.

Alice Slade

The central nervous system (CNS) is composed of the brain (cerebrum, cerebellum and brainstem) as well as the spinal cord. There are 12 cranial nerves that connect the brain to different parts of the head, neck, and body (the peripheral nervous system - PNS). The primary role of the CNS is to process sensory information being relayed from peripheral organs. The primary role of the PNS is to connect the CNS to the organs, limbs, and skin.

The CNS functions by receiving signals from the peripheral organs. The signals are passed along the spinal cord to the brain. The brain then processes this information and generates an appropriate response, which is sent back to the peripheral organs, such as the limbs.

For example, if a finger touches a hot cooker, the heat signal is sent via the PNS to the CNS, which then responds by sending a nerve signal to the finger for it to be removed from the heat source (the hot cooker).

The CNS is also responsible for processing sensory signals, such as reflex actions. For example, the knee-jerk reaction that happens when the tendon in the knee is sharply knocked is a reaction between the spinal cord and the cerebellum in the brain.

The CNS is therefore responsible for reacting to sensory input by processing the information and coordinating appropriate motor (movement) responses. 

Hardi Soni

Central Nervous System is the main branch which controls our nervous system. It contains brain and spinal cord.

Temitope L

The central nervous system refers to the spinal cord and the brain, they receive sensory information from sensory neurons, which is then transmitted to motor neurons via relay neurons. Motor neurons then transmit this information to the effector (a muscle that will generate a response, e.g. a muscle in your hand that will cause you to move away when you touch something hot). It is called 'central' because it co-ordinates neural activity across the body

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