I believe it is D. I researched it and it explained the same thing as D
Answer: d. none of the above
Explanation:
The respiratory membrane is the membrane which separates the air inside the alveoli from the pulmonary capillaries. The types of respiratory membranes includes the alveoli membrane, the capillary membrane and the basement membrane. The respiratory membrane is usually very thin. But it becomes thick due to the increase in the fluid content, which actually forces the gases to diffuse through the membrane and the fluid. Also the pulmonary diseases can also cause the membrane to become thick.
The four tissue types that have intercellular junctions are;epithelial tissue, connective tissue, muscle tissue andnervous tissue.
