Question

what is the lining that covers the lungs?
what are found in the walls of the trachea?
when inhaling, does the diaphragm muscle contract or relax and what affect does it have?

thanks

Answer 1

serous membrane lining covers the lungs
4 layers of tissues form the wall of trechae
when inhaling diaphragm muscle both contracts and relaxes resulting in the the Rise and fall of Abdomen

Answer 2

A clear, thin, shiny covering ( known as the serous coat, or pleura) covers the lungs.
The mucosa is the innermost layer of trachea and consists of ciliated pseudostratified columnar cell.
When inhaling the diaphragm muscle contract and the chest cavity comes outward.