A body system or tract that has an opening to the environment is always lined with a:
A)mucous membrane
B)serous membrane
C)columnar epithelium membrane
D)none of these,because the membrane varies by body system

Question

Quizplus · Accepted Answer

Mucous membranes are specialized epithelial membranes that line the body systems or tracts that have openings to the environment, such as the respiratory, digestive, and reproductive systems. They produce mucus to protect the lining and trap foreign particles or pathogens.

A Body System or Tract That Has an Opening to the Environment