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

Define natural killer cells - humoral mechanisms, Define Natural killer cel...

Define Natural killer cells (NK cells) They are large sized lymphocytes, specifically equipped to kill virally infected cells, some of the virally infected cells acquire a spec

Uses vitamin e, Vitamin E  (Tocopherols) Vitamin E is an essential fat-...

Vitamin E  (Tocopherols) Vitamin E is an essential fat-soluble vitamin that functions, at  least in part, as a lipid- soluble antioxidant. Presence of vitamin E was first revea

Nutrition in plants, what are the five nutrition in heterotrophic nutrition...

what are the five nutrition in heterotrophic nutrition

Photochemical smog, Photochemical Smog: Photochemical  smog, a  seconda...

Photochemical Smog: Photochemical  smog, a  secondary Pollutant,  results when  the two pollutants, nitrogen  oxide and hydrocarbons  found  in  automobile exhausts, react with

Define age related changes in excretory system, Define age related changes ...

Define age related changes in Excretory System There is a progressive decrease in the number and size of nephrons fiasic unit of the kidney). There is a 10% decrease in renal p

Gravity, Why does gravity effect people?

Why does gravity effect people?

Ionising radiations, Ionising Radiations " The three types of ionising radi...

Ionising Radiations " The three types of ionising radiations mentioned above penetrate matter to different extent. Table summarises the nature, ionising power and penetration of th

Determine about the bicarbonates, Determine about the Bicarbonates Bica...

Determine about the Bicarbonates Bicarbonates are highly soluble, Ca(HCO3)2 goes into solution. Further,  stronger acids, like nitric a nd sulphuric acid present  in soils thro

Mineral, What are some faqs about the mineral Bloodstone.

What are some faqs about the mineral Bloodstone.

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