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

Why there is more calcium than potassium on clay colloid, Why is there more...

Why is there more exchangeable calcium than potassium on clay/humus colloid? Calcium is usually abundant except in acid soils which occur in humid area due to excessive leaching.

True, what is the first layer of the earth

what is the first layer of the earth

Levels, what would i need to do to achieve a 7C in science , KS3??

what would i need to do to achieve a 7C in science , KS3??

Explain the rectum and anal canal, Explain the Rectum and Anal Canal R...

Explain the Rectum and Anal Canal Rectum: This is a slightly dilated part of the colon. It leads from the pelvic colon. Anal canal: This is a short canal which leads fro

Explain the adrenocorticotropic hormone (acth), Explain the Adrenocorticotr...

Explain the Adrenocorticotropic Hormone (ACTH) ACTH, also known as corticotrophin, is a polypeptide and is synthesized by corticotroph cells of the anterior pituitary gland. It

Physical universe, Physical universe: The universe is vast. The Earth w...

Physical universe: The universe is vast. The Earth we live on appears to be just  a speck of dust circling a small star in a remote corner of  an obscure galaxy. If  we are a s

Explain macrophages, Explain Macrophages They are large, long living ef...

Explain Macrophages They are large, long living effective phagocytes, which enlarge out of monocytes. It is an irregular cell about 25-50 mm in size. It has a large ovoid nucle

Determine the bravais lattice of the element, An x-ray diffractometer recor...

An x-ray diffractometer recorder chart for an element that has either the BCC or the FCC crystal structure shows diffraction peaks at the following 2θ angles: 40 0 , 58 0 , 73 0 ,

What are the three major types of rocks, What are the three major types of ...

What are the three major types of rocks? Ans) The three kinds of rocks are as follows: 1) Igneous rock (from volcanoes etc) 2) Sedimentary rock (Dead Sea creatures, time

Animal tissue, any information about animal tissue

any information about animal tissue

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