Why are many physical relations involuntary?

Gouse Basha By Gouse Basha , 18th Nov 2012 | Follow this author | RSS Feed
Posted in Wikinut>Health>General Health>Oral Care


Vital bodily functions like breathing, heartbeat, digestion and temperature control are regulated unconsciously. They are governed by what is known as the automatic nervous system. Since these processes have to be kept going non-stop, waking or sleeping ,It would not make sense for them to be controlled voluntarily.It is only because they are fully automatic that important reflexes occur quickly and

About our body


Vital bodily functions like breathing, heartbeat, digestion and temperature control are regulated unconsciously. They are governed by what is known as the automatic nervous system. Since these processes have to be kept going non-stop, waking or sleeping ,It would not make sense for them to be controlled voluntarily.It is only because they are fully automatic that important reflexes occur quickly and reliably.


The body is the same temperature all over !

Although the human body has its thermostat, which is set at 37c,this temperature is only constant in the brain and core of the body. Depending on the outside temperature and the level of muscular activity, arms and legs can sometimes be a few degrees warmer or colder than the set point. Slight fluctuations in body temperature are also linked to our daily cycle of waking and sleeping . As we become tired , our body temperature drops, only to rise again when we wake after a sleep.

Stomach
If some time has passed since our most recent meal, the stomach is empty or ,to be more precise,it contains only gastric juices and swallowed air. The otherwise silent , slow and regular contractions of the stomach walls become stronger and produce a gurgling sound. However ,these hunger contractions subside as soon as we eat something. The intestines can produce similar noises when the food pulp and gas it contains are being moved steadily down its length.

Why do we sweat?


The human body has between 2 and 3 million sweat glands distributed over its surface. Their job is to release fluid when the body becomes overheated. Sweat is made up of salt , protein and urea dissolved in water. As it evaporates on the skin ,it produces a cooling effect which helps to reduce body temperature. Extreme heat or physical efforts produces more than 1 litre of sweat per hour.

Hot and spicy food can also causes us to sweat, as can fear and stress when messages pass to the autonomic nervous system which controls perspiration. Damp , sweaty hands,that can grasp things better than dry ones, are a part of our natural fight-or-flight response.

How heavily an individual perspires is genetically determined, but there are also gender differences to talk into account. Some disorders can cause excessive sweating, with up to five times as much sweat being produced as normal.

Tags

Nervous System, Skin, Stomach, Thermostat

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author avatar Gouse Basha
Hi i am gouse .

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Comments

author avatar Sivaramakrishnan A
18th Nov 2012 (#)

Thanks for the useful information, Gouse - siva

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