Which term is associated with the word "ventricul/o"?

The term "ventricul/o" specifically refers to a chamber or cavity, and in a medical context, it is most commonly associated with the heart. The heart has two ventricles, which are the lower chambers that play a crucial role in pumping blood to the lungs and the rest of the body. The use of "ventricul/o" in medical terminology directly indicates this association with the heart's chambers.

In contrast, the other terms listed do not relate to "ventricul/o." The large intestine is described using different prefixes or terms, brain cells are referred to as "neur/o" or specific types like "astrocyte" or "neurons," and bone marrow is denoted by terms such as "myel/o." Thus, the correct association with "ventricul/o" is indeed the chamber of the heart.