Autonomic system, Science

Assignment Help:

Autonomic System:

The autonomic nervous system gets its name from the fact that it relates to autonomous*or self-regulatory activities such as digestion and circulation, which continue even when we are asleep or unconscious. Impulses from the brain and spinal cord travelling along the autonomic nerves, cause blood vessels to dilatwr contract, digestion to slow or speed up, body  temperature to rise or fall, all according to the changing requirements.

The autonomic system consists of  two sets of nerves: The sympathetic nerves which stimulate the body  to react in a situation of stress or danger by  increasing the blood pressure, heart beat rate, breathing and flow of blood to the muscles, and by decreasing  the flow of blood to the digestive organs and kidneys. All these reactions are a preparation for a sudden expenditure  of energy in either fighting or fleeing. The parasympathetic nerves which prepare the body  for relaxed functions.

The autonomic nervous system does, however, interact with conscious nervous activity. For example, it is well known that anxiety and mental tension can affect digestion,  they tven cause peptic ulcers or high blood pressure. A child's dislike for school may make him sick every morning, without his being conscious of  the connection. Under certain conditions, with  lot of practice, some people have found it possible to consciously control heart beat, or blood pressure, or body  temperature or breathing rate and oxygen intake; others may regulate the feeling of pain or even correct malfunction of an organ. But these are extraordinary  and excepticnal abilities  ckveloped with tremendous expenditure of time and effort.  


Related Discussions:- Autonomic system

Objectives of fire safety measures in a laboratory, Objectives After y...

Objectives After you have completed this exercise, you should be able to: 1.      Enlist all the fire extinguishers available in the labs and relate them to the type of fire

Explain immunoblotting (western blots), Explain Immunoblotting (Western blo...

Explain Immunoblotting (Western blots) In this technique, different Ag (which may be viral proteins) is separated by electrophoresis in a solid phase They are subjected to ele

Evaporation disposal of chemical wastes, Evaporation Highly volatile li...

Evaporation Highly volatile liquid wastes could be disposed of by effective ventilation. Example : Diethyl et-her. Moderately volatile liquid wastes can be absorbed on

Define the term bel, Define the term Bel Bel, the unit of measurement o...

Define the term Bel Bel, the unit of measurement of sound, is named after Alexander Graham Bell; Bell was the inventor of the telephone, but for some curious reason, is spelt w

Moisture comes from other plants, Moisture comes from other plants Secu...

Moisture comes from other plants Secure a flower pot which has some bean or pea seedlings that are 10 or 15 cm in height. Cover the top of the pot with cellophane or sheet rubb

Define the olfactory area of the cerebrum, Define the olfactory area of the...

Define the olfactory area of the Cerebrum The olfactory area lies deep within the temporal lobe. Look at Figurefor its position. Cells receive and interpret impulses from nose

Nervous tissue, types of neuron according to function

types of neuron according to function

Explain main factors that influence mass movement, Discuss main factors tha...

Discuss main factors that influence mass movements. Ans) Things as if climate and food availability will make a big dissimilarity if it is too cold, too dry then people will re

How you can observe the buoyancy of water, You can observe the buoyancy of ...

You can observe the buoyancy of water Make an equivalent arm balance. Secure two soda water-bottles and suspend them with loops of string from either side of the arm. Unless th

Separating mixture, laboratory apparatus for separating mixture

laboratory apparatus for separating mixture

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