The nervous system consists of the brain, spinal cord, sensory organs, and all of the nerves that connect these organs with the rest of the body. It's main purpose is to gather, store, and respond to information and stimuli.
Nervous tissue's main purpose is to react to stimuli and send impulses to various organs in the body which then return and relay a direct response to stimulus. Nervous tissues are made up of millions of nerve cells which are known as neurons.
Although the system forms a unit it can be divided into the following parts: the central nervous system (CNS) which consists of the brain and spinal cord, the nervous systemconsists of the nerves outside the CNS which connect the brain and spinal cord to the organs and muscles of the body and the automatic or involuntary nervous system consists of nerve centres and fibres inside as well as outside the central nervous system.
There are three main types of neurons, which are classified according their function: Those that conduct impulses from the sensory organs to the central nervous system (brain and spinal cord) are called sensory (or afferent) neurons; those that conduct impulses from the central nervous system to the effector organs (such as muscles and glands) are called motor (or efferent) neurons. Interneurons (also known as connector neurons or association neurons) are those that connect sensory neurons to motor neurons.
Structure of a Motor NeuronA motor neuron has many processes (cytoplasmic extensions), called dendtrites, which enter a large, grey cell body at one end. A single process, the axon, leaves at the other end, extending towards the dendrites of the next neuron or to form a motor endplate in a muscle. Dendrites are usually short and divided while the axons are very long and does not branched freely. The impulses are transmitted through the motor neuron in one direction, i.e. into the cell body by the dendrites and away from the cell body by the axon . The cell body is enclosed by a cell (plasma) membrane and has a central nucleus. Granules, called Nissl, bodies are found in the cytoplasm of the cell body. Within the cell body, extremely fine neurofibrils extend from the dendrites into the axon. The axon is surrounded by the myelin sheath, which forms a whitish, non-cellular, fatty layer around the axon. Outside the myelin sheath is a cellular layer called the neurilemma or sheath of Schwann cells. The myelin sheath together with the neurilemma is also known as the medullary sheath. This medullary sheath is interrupted at intervals by the nodes of Ranvier.A motor neuron
Nerve cells are functionally connected to each other at a junction known as a synapse, where the terminal branches of an axon and the dendrites of another neuron lie in close proximity to each other but never make direct contact.
A Synapse
Classification of NeuronsOn the basis of their structure, neurons can also be classified into three main types:Sensory neurons have only a single process or fibre which divides close to the cell body into two main branches (axon and dendrite). Because of their structure they are often referred to as unipolar neurons.
Motor neurons, which have numerous cell processes (an axon and many dendrites) are often referred to as multipolar neurons. Interneurons are also multipolar.
Bipolar neurons are spindle-shaped, with a dendrite at one end and an axon at the other . An example can be found in the light-sensitive retina of the eye.
A diagram showing the different neurons
Functions of Nerve Tissue1.Sensory input
2.Integration
3. Controls of muscles and glands
4.Homeostasis
5.Mental Activity
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the nervous system's purpose is to gather, store, and respond to information.
1.Sensory input
2.Integration
3. Controls of muscles and glands
4.Homeostasis
5.Mental Activity
Nerve tissue transfers signals in the body and its organ to tell the body how to respond to changes in its internal and external environments.
To send signals to control the body
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Epithelial, Nervous, and Muscular tissue.
nervous tissue
The endocrine system controls and coordinates body activities and it is made up of ductless glands and some diffuse tissues. Diffuse tissues are cells within organs and tissues that secrete hormones. So, the answer would have to be glandular tissue and diffuse tissue.
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Nervous tissue.
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Epithelial, Nervous, and Muscular tissue.
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The Nervous Tissue
The endocrine system controls and coordinates body activities and it is made up of ductless glands and some diffuse tissues. Diffuse tissues are cells within organs and tissues that secrete hormones. So, the answer would have to be glandular tissue and diffuse tissue.
Nervous Tissue
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