why our body is basic in nature ?
please answer it fast i need is immediately .
Answers
Answer:
In general, the pH level of the blood is slightly alkaline, around 7.4. The pH of blood is very narrow and usually does not go anywhere beyond 7.45, with the ideal being 7.4. Basically, when an individual is healthy, his/her body pH is balanced between an alkaline and an acidic environment. However, the pH for various parts of the digestive system vary according to the organ and the need of the enzymes. These are enlisted below:
Mouth:
The pH of saliva is usually slightly acidic to neutral, hovering around 6.5 to 7.5, so as to ensure proper functioning of the enzyme salivary amylase or ptyalin.
Stomach:
The pH of stomach is very low and highly acidic, being around 4-6 in the upper stomach and around 1.5-3 in the lower stomach. This low pH is due to the hydrochloric acid present in this organ, which helps to ensure proper functioning of the enzyme pepsin.
Intestines:
The pH of the intestines is usually slightly acidic to neutral, being around 5-7, as this is the pH at which the enzymes in this region functions.
Decrease in pH
Acidosis is a condition where there is low pH level in the body, due to which the blood becomes acidic. This happens due to the hydronium ion concentration increasing in the blood. So, when its value in blood falls below 7.35, the acidosis symptoms start showing up. This usually happens when there is less oxygen and an increase in carbon dioxide content in the blood. There are different kinds of acidosis, like respiratory, metabolic, diabetic, and lactic. Thus, the symptoms and treatment for each of these vary accordingly.
Increase in pH
Alkalosis is a condition where the pH levels increase to more than 7.45, usually due to a decrease in the hydrogen ion concentration. There are primarily two types of alkalosis, viz., respiratory and metabolic. Alkalosis of the respiratory type is usually due to hyperventilation, because of which there is a loss of carbon dioxide. Metabolic alkalosis is due to excessive vomiting, leading to loss of hydrochloric acid from the stomach. One of the main dangers associated with alkalosis is hypokalemia. Thus, the symptoms include muscle weakness, cramping, and constipation. The treatment for this condition varies depending on the type of alkalosis.
To control the pH of our body the entire buffer system plays a vital role.
Here is a chart of our body's buffer elements. Among them the carbonate buffer is more spreadeagled.
Now, H₂CO₃ -------------------► 2H⁺ + CO₃²⁻
here, H₂CO₃ is a weak acid and CO₃²⁻ is the conjugate acid of H₂CO₃. For that reason CO₃²⁻ is a weak base.
In addition some other buffer (phosphate, some protein) are also weak base. For that reason the pH of our body is slightly basic in nature.