$\textbf{{\color{#4257b2}Epithelial membranes}}$ are located in the internal and external surfaces of the body as lining and covering, respectively.

$$\textbf{{\color{#4257b2}Examples of cavities lined by a mucous membrane: }}$$

• Mouth.
• Nose.
• Lungs.
• Digestive tract.
• Bladder.

$$\textbf{{\color{#4257b2}Examples of cavities lined by a serous membrane: }}$$

• Pleural cavity.
• Pericardial cavity.
• Peritoneal cavity.