Question

Why is inner wall of ailimantry canal not digested although the digestive enzyme can digest all the materials that makes cell

Answer 1

Yes, it is true that our elementary canal produces various types of concentrated acids which can even digest and kill the body cells.

But
In addition with the enzymes, the alimentary canal also produces various other things which protect the alimentary canal.

STOMACH

Stomach produces concentrated hydrochloric acid.
It produces so because the in stomach there are secretions known as pepsinogen and pro-renin which is inactive form.
To make it active the HCL is produced.
But,
We know that the stomach 's inner lining is very very sensitive.
So, to protect it the stomach also produces other secretion known as MUCUS.
This mucus protects the inner lining of the stomach from the action of the concentrated HCL.
But, sometimes due to acidity ( production of HCl in excess amount and in empty stomach)
The mucus protection becomes incapable.
So, this results in a situation known as peptic ulcers.

In other parts there is no need of protection as no acidic medium is created in oesophagus and duodenum.
Also, In parts of small intestine and large intestine ( colon, Rectum and anus ) there is no need of the production of the protecting agent.


That is why the inner wall of the alimentary canal is not affected due to production of enzymes.

Answer 2

Yes, it is true that our elementary canal produces various types of concentrated acids which can even digest and kill the body cells.

But

In addition with the enzymes, the alimentary canal also produces various other things which protect the alimentary canal.

STOMACH

Stomach produces concentrated hydrochloric acid.

It produces so because the in stomach there are secretions known as pepsinogen and pro-renin which is inactive form.

To make it active the HCL is produced.

But,

We know that the stomach 's inner lining is very very sensitive.

So, to protect it the stomach also produces other secretion known as MUCUS.

This mucus protects the inner lining of the stomach from the action of the concentrated HCL.

But, sometimes due to acidity ( production of HCl in excess amount and in empty stomach)

The mucus protection becomes incapable.

So, this results in a situation known as peptic ulcers.

In other parts there is no need of protection as no acidic medium is created in oesophagus and duodenum.

Also, In parts of small intestine and large intestine ( colon, Rectum and anus ) there is no need of the production of the protecting agent.

That is why the inner wall of the alimentary canal is not affected due to production of enzymes.