Hydrogen Ion And pH

| Home |

Chapter: Anatomy, Physiology And Health Education : Acid-Base Balance

Hydrogen ion (H+) contains only a single proton (positively charged particle), which is not orbited by any electron. Therefore, it is the smallest ionic particle. However, it is highly reactive. Because of this, the H+ shows severe effects on the physiological activities of the body even at low concentrations.


HYDROGEN ION AND pH

 

 

Hydrogen ion (H+) contains only a single proton (positively charged particle), which is not orbited by any electron. Therefore, it is the smallest ionic particle. However, it is highly reactive. Because of this, the H+ shows severe effects on the physiological activities of the body even at low concentrations. The normal H+ concentration in theextracellular fluid (ECF) is 38 to 42 nM/L.

 

The pH is another term for H+ concentration that is generally used nowadays instead of ‘hydrogen ion concentration’. The pH scale was introduced in order to simplify the mathematical handling of large numbers.

 

Negative logarithm of H+ concentration is taken for calculating the pH as given below.


 


An increase in H+ ion  concentration  decreases  the pH (acidosis) and a reduction in H+ concentration increases the pH (alkalosis). An increase in pH by one- fold requires a tenfold decrease in H+ concentration (Table 5.1).



 

In a healthy person, the pH of the ECF is 7.40 and it varies between 7.38 and 7.42.

 

The maintenance of acid- base status is very important for homeostasis, because even a slight change in pH below 7.38 or above 7.42 will cause serious threats to many physiological functions.

 

Copyright © 2019, 2020 pharmacy180.com; Developed by Therithal info.