Answer:
Mucous membrane in mouth other parts of body is the portal of entry polio virus use.
Step-by-step explanation:
Polio virus is the cause of polio diseases and are usually present in food or water contaminated with the stool of an infected person. This virus usually gets into the body through mouth when a healthy person ingests this virus through contaminated water or food.
After getting in the body this virus gets absorbed in mucosal cell and mucous membranes present in pharynx and intestine and replicate there. These viruses can move to the motor neuron and can replicate there which causes the destruction of these neurons. This destruction of neurons can cause permanent paralysis.
Therefore mucous membrane function as entry portal of poliovirus.