Final answer:
The statement that skin, gastrointestinal tract, respiratory tract, urogenital tract, transplacental (except for some exceptions) are considered portals of entry for pathogens is True. These mucosal surfaces are vulnerable to penetration by microorganisms, thus acting as potential entry points for infectious diseases.
Step-by-step explanation:
The statement refers to the concept that skin, gastrointestinal tract, respiratory tract, urogenital tract, transplacental (exceptions) are considered portals of entry for pathogens. This statement is True. Mucous membranes line various tracts of the body and are coated with secretions from mucous glands. These membranes provide a barrier; however, they also represent areas where pathogens can enter the body. The gastrointestinal and respiratory tracts are particularly vulnerable portals because microorganisms are continuously inhaled or ingested. The urogenital tract is lined with mucous membranes that can be penetrated by pathogens, and while the placenta usually serves as a barrier against infections, there are exceptions where pathogens can cross this barrier.