# Which of the following is a simple cell type that lines the heart, blood, and lymph vessels?
a. Squamous.
b. Columnar.
c. Cuboidal.
d. Transitional.
The correct answer is A. Squamous.
Squamous cells line the heart, blood, and lymph vessels. Columnar cells are located in most glands, small intestines, and respiratory passages. Cuboidal cells are located in the kidney, glands, and respiratory passages. Transitional cells are located in the urinary passages and bladder.
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