Neural circuits, Biology

Assignment Help:

Neural Circuits

The simple all are none activities of a single neuron can hardly provide the adaptability needed for the constant changes faced by the organism in its internal and external environments. Information about the external environment is integrated with signals arising within the organism and transmitted to effectors to elicit a coordinated response. Thus each neuron forms a unit in a communication circuit. A survey of the features of the nervous system in the animal groups at various points on the phylogenetic tree shows that a long evolutionary process has produced the outstanding complex structure of the human brain.

83_Neural Circuits.png

Figure: Nerve Net in Jelly Fish

Protozoans are single celled organisms and clearly cannot have a nervous system. An examination of the electrical properties of the protozoan cell membrane would, however, show many similarities to those of nerve cells including electrical potential changes and currents associated with activity. Coelenterates are of great interest neurologically since they are the first animals to possess a true nervous system. The coelenterate nervous system consists of a diffuse network of neurons that are distributed throughout the body wall. Such a simple and primitive nervous system is termed a nerve net in which neurons are dispersed mostly at random. Though primitive, this arrangement serves the need of a radially symmetrical animal whose food and enemies may approach from all directions. The animal's reaction depends on the strength of the stimulus. Only a part of the body reacts to a weak stimulus and a strong stimulus causes the entire animal to respond. From such diffuse primitively organised system of nerve cells, evolution has produced a complex organized nervous system such as that of man. The system of local nerve nets, however continues to exist even in many advanced invertebrate groups and in the intestines of vertebrates.


Related Discussions:- Neural circuits

Protein of animal origin - meat, Protein of Animal Origin - Meat Meat:...

Protein of Animal Origin - Meat Meat: Skeletal or striated muscles are used for food purposes. Flesh of cattle, sheep and swine comprise most of the meat contents. Edible mea

Explain the term- loss-of-function mutation, Where would a predicted silent...

Where would a predicted silent mutation have to be situated to actually result in a loss-of-function mutation (and potentially lead to the onset of disease)? A. Intron-exon jun

Stirred tank reactors, The next set of lectures in this course cover a num...

The next set of lectures in this course cover a number of topics including fermenter design, power consumption, oxygen transfer and mixing. The aim of these lectures is to underst

Define burette - nutritional biochemistry, Define Burette - Nutritional Bio...

Define Burette - Nutritional Biochemistry A burette is a vertical cylindrical piece of laboratory glassware with a volumetric graduation on its full length and a precision tap,

State the term - molybdenum, State the term - Molybdenum   Molybdenum i...

State the term - Molybdenum   Molybdenum is intimately related to nitrogen metabolism of plants. It is part of the nitrate reductase system which helps to utilise nitrate for n

What is the basic role of botanic garden, Q. What is the basic Role of Bota...

Q. What is the basic Role of Botanic Garden? A botanic garden makes us to simply enjoy the beauty and variety of nature. The pleasure of admiring turns us into good naturalists

Evolution, related words for reproductive isolation.

related words for reproductive isolation.

Principles of cardiopulmonary bypass mechanism (cpb), PRINCIPLES OF CARDIOP...

PRINCIPLES OF CARDIOPULMONARY BYPASS MECHANISM (CPB) What is CPB? It is a technique by which the mechanical function of the heart and respiratory function of the lungs

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd