Multiple choice Which of the following lines the heart and lymph vessels? Squamous epithelium Columnar epithelium Cuboidal epithelium Ciliated epithelium Muscular tissues Reveal answer Fill a bubble to check yourself A Correct answer Explanation Squamous epithelium forms the outermost layer of skin, and lines the body's cavities and other parts. These include the heart, alveoli, the blood and lymph vessels and the oesophagus.