Explain parasympathetic nerves system, Science

Assignment Help:

Explain parasympathetic Nerves System

Another system that runs parallel to the sympathetic system is termed as the parasympathetic system. This system has an effect just opposite to the sympathetic system. It relaxes the heart, decreases the heart rate (negative chronotropic), the force of contraction (negative inotropic), the conduction rate (negative dromotropic) and the excitability of tissue (negative bathmotropic). The nerves that supply the heart's atria are termed as vagi (singular vagus). As the name suggests, vagus is a vagabond, a wanderer charting an unfamiliar, vague course supplying the digestive tract, heart, the voice box etc. The heart is supplied by the right and left vagi. The peculiarity is that they do not supply the ventricles. The sympathetic system only supplies the ventricles. Overall, we have seen that the heart hangs in a balance of positive and negative forces: the sympathetic and parasympathetic system. Now you know the mechanism that may be operating when our yogis increase their heart rate or stop it! The sympathetic nerves have a chemical neurotransmitter called nor-adrenaline, whereas, the parasympathetic nerves release acetylcholine at the postganglionic nerve endings.


Related Discussions:- Explain parasympathetic nerves system

Steps involved during preparation of raw materials, Q. What are the prelimi...

Q. What are the preliminary steps involved during preparation of raw materials? Preliminary steps involved during preparation of raw materials include cleaning, peeling, cuttin

Reflexes, Reflexes: It is of  interest  to know,  that all sensory in...

Reflexes: It is of  interest  to know,  that all sensory information does not have to go to the  -  brain before we can react to a stimulus. Our responses to certain stimuli

Explain the physiology of lactation, Explain the Physiology of Lactation ...

Explain the Physiology of Lactation Lactogenesis is the onset of copious milk secretion around parturition, triggered by a fall in plasma progesterone levels. Although some col

Poisons-storage of chemicals, Poisons : It is essential that all dangerous...

Poisons : It is essential that all dangerous substances, such as cyanides, are always kept under strict control. Steps to ensure such control are as follows: i) All substances

Explain the general examination - examination of urine, Explain the General...

Explain the General examination - Examination of Urine This includes general appearance, volume and specific gravity together with the simple chemical tests for reaction, album

Explain the closed system - thermodynamic, Explain the Closed System - Ther...

Explain the Closed System - Thermodynamic The system that can exchange energy with their surrounding but not the mass is known as the Closed System. So, the quantity of matter

Explain abnormalities due to changes in serum electrolytes, Explain Abnorma...

Explain Abnormalities due to Changes in Serum Electrolytes The intracellular and extracellular electrolyte concentration difference is responsible for the resting membrane pot

Interpersonal relations, Interpersonal Relations Mr. X relates easily...

Interpersonal Relations Mr. X relates easily to others and describes himself in positive terms (Ho=38). He believes that others can be trusted and that they have his best int

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